Microbiological and sensory characteristics of pork loin chops: Role of subcutaneous fat

Pork loin chops with the subcutaneous fat attached, without subcutaneous fat and the subcutaneous fat that was removed from chops were packaged and stored at 4°C±1°C in polyvinyl chloride (PVC) film for 0-6 days or in high-oxygen barrier (HOB) film for 0-28 days. Aerobic plate counts (APCs) of lean and fat of intact chops packaged and stored in either PVC or HOB film did not differ (P>0·05) in most comparisons. The APCs of subcutaneous fat portions that were packaged and stored separately in HOB film often were higher than those of comparable fat samples of intact chops. There was no consistent pattern of differences in the microflora of lean and fat samples. Differences in mean scores for surface discoloration, off odor and overall appearance of intact chops and chops without subcutaneous fat usually were either not significant (P>0·05) or inconsistent. Lean color scores of chops with or without subcutaneous fat did not differ except that chops with the subcutaneous fat removed were rated higher than intact chops during the early periods of storage. Fat color of subcutaneous fat packaged and stored separately in HOB film was often rated higher (slightly whiter) than that of comparable fat of intact chops.     

Reovirus-specific polypeptides: analysis using discontinuous gel electrophoresis

An analysis of reovirus-specific polypeptides in cells infected with temperature-sensitive mutants under permissive and nonpermissive conditions revealed the presence of (i) all the known viral polypeptides and (ii) aberrant migration of the mu 1 and mu 2 polypeptides in four groups of mutants.     

Effects of dietary molybdenum on the metabolism of copper and molybdenum in young cattle

On separate occasions young cattle were injected intrarumenally with 99Mo or 64Cu or intravenously with 64Cu. The metabolism of the isotopes were compared to evaluate metabolic changes associated with molybdenum-induced copper deficiency. Molybdenum-99 metabolism was the same in both controls and experimental subjects. Marked differences in plasma kinetics were observed following intrarumenal 64Cu injection, with experimental animals displaying earlier plasma appearance and maintaining higher plasma levels than did controls. Similarly, higher plasma levels, more rapid plasma reappearance and greater fecal excretion were observed following intravenous injection of 64Cu in the experimental animals than in controls. A mechanism involving abnormal ceruloplasmin synthesis associated with the molybdenum-copper interaction is proposed.     

Pyloric stenosis: a 13-year experience in operative management

Infantile hypertrophic pyloric stenosis is best treated surgically, after an appropriate period of rehydration and resuscitation. Our experience with this entity has resulted in the performance of fewer contrast studies to establish the diagnosis as well as the use of an operative technique which can be safely applied to the teaching environment.     

Nitrogenase activity and respiration of cultures of Rhizobium spp. with special reference to concentrations of dissolved oxygen

Studies of nitrogenase in cultures of the cowpea rhizobia (Rhizobium spp.) strains 32H1 and CB756 are reported. Preliminary experiments established that, even when agar cultures were grown in air, suspensions of bacteria prepared anaerobically from them were most active at low concentrations of free dissolved O2. Consequently, assays for activity used low concentrations of O2, stabilized by adding the nodule pigment leghaemoglobin. In continuous, glutamine-limited cultures of 32H1, nitrogenase activity appeared only when the concentration of dissolved O2 in the cultures approached 1 muM. Lowering the glutamine concentration in the medium supplied to the culture from 2 to 1 mM halved the cell yield and nitrogenase activity was also diminished. Omitting succinate from the medium caused the concentration of dissolved O2 to rise and nitrogenase activity was lost. Upon restoration of the succinate supply, the O2 concentration immediately fell and nitrogenase was restored. The activity doubled in about 8 h, whereas the doubling time of this culture was 14 h. Sonic extracts of 32H1 cells from continuous cultures with active nitrogenase contained components reacting with antiserum against nitrogenase Mo-Fe protein from soybean bacteroids. Continuous cultures grown at higher O2 concentration, with only a trace of active nitrogenase, contained less of these antigens and they were not detected in highly aerobic cultures. Nitrogenase activity of a continuous culture was repressed by NH+4; the apparent half-life was about 90 min. Cells of 32H1 from a continuous culture growing at between 30 and 100 muM dissolved O2 possessed a protective mechanism which permitted respiration to increase following exposure to a rapid increase in O2 concentration from low levels (O2 shock). This effect disappeared as the O2 concentration for growth was reduced towards 1 muM.     

Haemorrhagic syndrome after massive transfusion of blood for traumatic liver rupture: disseminated intravascular coagulation? (Author''s transl)

The rate of control of thyrotoxicosis during the first 2 weeks of treatment was documented in 63 patients. Twenty-three patients received carbimazole 40 mg plus lithium carbonate 750 mg daily and a comparable group of 20 patients were given carbimazole 40 mg plus potassium iodide 120 mg daily. In the lithium treated patients the mean percentage fall of serum T4 after 2 weeks treatment was 49% and the fall in serum T3 57%. The results were similar in the iodide treated patients; the mean falls in serum T4 and T3 being 47% and 64%, respectively. Serum lithium values varied between 0.1-1.25 mEq./l; lithium side effects were minor. In a companion study 20 patients were treated with carbimazole alone. The responses in this group were less impressive; the mean falls in serum T4 and T3 at 2 weeks being 18% and 36%, respectively. It is concluded that lithium is a safe adjunct to conventional antithyroid drug therapy in the initial treatment of acute thyrotoxicosis.     

Consumer-professional collaboration for evaluation in neighborhood mental health programs

Neighborhood mental health programs are challenged with the scientific and fiscal necessity of evaluating their services. Since most such programs are joint endeavors of neighborhood residents (usually a consumer board) and nonneighborhood professionals, such evaluative efforts require the sanction and collaboration of both groups to be maximally effective. However, the authors point out that collaboration is often strained by lack of trust and conflicts of interest. Study design may fail to consider neighborhood values, with the result that the provision of services is impeded, consumers are frightened or coerced, the role of paraprofessionals is threatened, and the consumer board's responsibilities to the neighborhood are ignored. The authors discuss those four issues and suggest ways of resolving them.     

Left ventricular function by echocardiography in children with fixed aortic stenosis

Left ventricular function was evaluated echocardiographically within 24 hours of cardiac catheterization in 45 children with fixed aortic stenosis. Left ventricular systolic time intervals, mean velocity of circumferential fiber shortening, left ventricular end-diastolic volume and shortening fraction were evaluated. Some patients with severe aortic stenosis had a shortened preejection period, prolonged ejection time and increased mean velocity of circumferential fiber shortening in comparison with normal subjects, but these findings were not consistent within the group with severe aortic stenosis or apparent in patients with mild or moderate aortic stenosis. Left ventricular end-diastolic volume was smaller in children with severe obstruction than in normal children. Evaluation of the shortening fraction provided good separation of patients with significant obstruction from those with mild disease. Further, there was a linear correlation between the shortening fraction and the left ventricular-aortic gradient demonstrated at cardiac catheterization. This correlation was also of use in evaluating the response of patients to surgical relief of obstruction. Pre- and postoperative echocardiographic evaluation of the shortening fraction appears to provide a readily available noninvasive method of assessing the course and severity of obstruction in fixed aortic stenosis in children.     

Extratemporal facial nerve injury

Isolated traumatic facial nerve injury, frequently seen in wartime combat, may also be encountered among civilians. The clinical picture occurring as a result of such injury may be confusing because partial, or incomplete, damage to the peripheral nerve may mimic impairment of the central facial motor mechanism. In treating the patient with facial injury, life-threatening aspects of the injury must be assessed and stabilized first. Then, attention may be focused on the injured facial nerve, for which prompt surgical repair is the treatment of choice. Prior to surgery, the assessment of taste and hearing, as well as mastoid and skull x-ray films and electrodiagnostic tests are helpful in localizing the facial nerve injury.