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We compared track-tube sampling with mark–recapture livetrapping and evaluated a track-tube index, defined as the number of track tubes with identifiable small mammal tracks during a 4-night period, as a predictor of small mammal abundance estimates in North Dakota grasslands. Meadow voles (Microtus pennsylvanicus) were the most commonly recorded species by both methods, but were underrepresented in track-tube sampling, whereas 13-lined ground squirrels (Spermophilus tridecemlineatus) and Franklin’s ground squirrels (S. franklinii) were overrepresented in track-tube sampling. Estimates of average species richness were lower from track tubes than from livetrapping. Regression models revealed that the track-tube index was at best a moderately good predictor of small mammal population estimates because both the form (linear versus curvilinear) and slope of the relationship varied between years. In addition, 95% prediction intervals indicated low precision when predicting population estimates from new track-tube index observations. Track tubes required less time and expense than mark–recapture and eliminated handling of small mammals. Using track tubes along with mark–recapture in a double sampling for regression framework would have potential value when attempting to estimate abundance of small mammals over large areas.

Mammalian predation influences waterfowl breeding success in the U.S. northern Great Plains, yet little is known about the influence of the landscape on the ability of predators to find waterfowl nests. We used radiotelemetry to record nightly movements of red foxes (Vulpes vulpes) and striped skunks (Mephitis mephitis) in two 41.4-km 2 study areas in North Dakota. Study areas contained either 15‐20% grassland (low grassland composition) or 45‐55% grassland (high grassland composition). Grasslands included planted cover, pastureland, and hayland. We predicted that the type and composition of cover types in the landscape would influence both predator movement across the landscape (as measured by the fractal dimension and displacement ratio) as well as localized movement (as measured by the rate of movement and turning angle between locations) within patches of different cover types. Red fox movements were straighter (lower fractal dimensions and higher displacements) across landscapes with a low grassland composition, indicating directed movement between the more isolated patches of planted cover. Striped skunk movements did not differ between landscape types, illustrating their movement along wetland edges, which had similar compositions in both landscape types. The high variability in turning angles by red fox in planted cover and pastureland in both landscape types is consistent with restricted-area foraging. The high rate of movement by red foxes in planted cover and by striped skunks in wetland edges suggests that spatial memory may influence movement patterns. Understanding the behavior of predators in fragmented prairie landscape is essential for managing breeding habitat for grassland birds and for predicting the spatial and temporal dynamics of predators and their prey.

Although persistent hoarseness has been recognized in patients who have sustained burn and/or smoke inhalation injuries, there is little documentation to support this observation. Furthermore, there is no quantification of either the pervasiveness of the problem or the severity of the dysphonia resulting. It was the intent of this study to examine the laryngeal condition and voice production of a group of patients who were long-term survivors of burns and inhalation injuries. Only 10 patients (8 male and 2 female) of a larger cohort were willing to return for this examination. They were ambulatory and did not require respiratory assistance, and it had been 16 to 25 years since their initial traumas. Videostrobolaryngoscopic examinations were performed and analyzed, measures of various acoustic and aerodynamic parameters were made, and severity of dysphonia was judged. Seven of the 10 subjects were rated by experienced listeners as having some degree of dysphonia. All subjects had some abnormality of the laryngeal mucosa. Stroboscopic examination was found to be helpful in identifying laryngeal abnormalities in at least half of the subjects. Early attention to these problems, many of which are treatable surgically or behaviorally or both could lead to an improved voice for the patient and for this reason an improved quality of life.

According to criteria established to define patients with smoke inhalation, the airway management of all victims of smoke and burns (1974 to 1984; n = 805) was reviewed. Fourteen percent of all patients were intubated (n = 117); patients intubated on the day of injury (n = 41) were more likely to extubate themselves or have technical problems with the endotracheal tube. Twelve percent of patients with smoke inhalation without burns required endotracheal intubation versus 62% of those with burns. An endotracheal tube was required for a median of 5 days. Tracheotomies were performed in 48 patients: 40% of those intubated and 6% of all patients. The mean postburn day for tracheotomy was day 15. There was no difference in the mortality rate for patients with an endotracheal tube only and those who had a tracheotomy as well: 42% and 37%, respectively. The prolonged length of stay for patients with a tracheotomy relates to the severity of the burn. Tracheotomy was not the cause of death in any patient. The strategy of grafting the neck before tracheotomy was used successfully in eight patients.

Victims of smoke inhalation with and without burns and burn patients with respiratory insufficiency for reasons other than smoke at a regional burn unit are profiled in terms of age, burn size, length of stay, and mortality. The diagnostic characteristics of patients with an inhalation injury (N = 108) are listed; 7% of all patients (N = 52) have known smoke exposure with equivocal evidence for injury to the airway or pulmonary parenchyma. The degree of respiratory (visceral) failure experienced by patients with inhalation injury is not uniformly severe. Many of the clues to this diagnosis are indirect and not always related to the severity of pulmonary injury. Timing and degree of visceral failure control the severity of the injury, which increases progressively from that in patients with a burn only (parietal injury) through those with a visceral injury only (smoke without burn), those with both smoke and burn, to those with a burn and uniformly severe respiratory failure on the basis of sepsis.

Microstomia is often an insidious complication of burns around the lips. The importance of prevention and early treatment is discussed. A new appliance for this purpose and its effective use in an edentulous patient are described. The intraoral extension of this prosthesis may be used in conjunction with a face mask to control scarring on the cheeks.

The construction of controlled environment chambers of high accuracy and low cost is described. Circuits for monitors and controllers for humidity are detailed, and construction of associated small-capacity conditioning equipment is discussed.

determination of phenylephrine hydrochloride in combination with other amine-type drugs. The mixture is placed on a sodium borate-Celite column and the nonphenolic amines are removed with chloroform. The phenylephrine remaining on the column is acetylated and removed with a chloroform wash. The acetylated phenylephrine is then saponified with alcoholic KOH and determined spectrophotometrically against standard phenylephrine at about 290 mμ. Recoveries averaged 98.5% with a range of 93.3–101.7%. Mean deviation from the average was 1.8%. The method was adopted as official, first action.