The chaotic behavior of systems with strange attractors can be discussed by examining the flip-flop process associated to the system dynamics. This was already shown by Lorenz (1963) in his first seminal paper. A somewhat surprising result was obtained by Aizawa (1982), who, studying the same Lorenz attractor at the ...

In order to operationalize the concept of 'social support', myocardial infarction (MI) survivors were asked to describe others who had been 'specially helpful' to them during their recovery, using an adjective checklist. Doctors were more likely to be described with words denoting expertise than were friends and family. However, about ...

In 12 newborns combined transcutaneous PO2 and PCO2 levels were measured by means of a Sensor Medics Transend Transcutaneous Gas System simultaneously with the end-tidal PCO2 (PetCo2) values using an Angström Eliza CO2 analyzer. Although the individual correlation coefficients differed greatly, the diagnostic sensitivity of PtcO2 and PtcCO2 was satisfactory ...

Qualitative expressions of probability, such as "likely," have different numerical meanings to different people, which can lead to misunderstanding among physicians and between physicians and patients. In a study conducted through a nationwide interactive computer network based at Massachusetts General Hospital, we gathered information on the meaning of common expressions ...

A 27-year-old male died as the result of swallowing a bag of cocaine. Using gas chromatography and ultraviolet spectrophotometry, the concentration of cocaine was determined on all specimens submitted for analysis. These analyses revealed what may possibly be the highest concentrations of cocaine ever reported in the toxicology literature. These ...

An investigation was carried out to determine the factors influencing the vibration of chipping hammers and to find ways of reducing the vibration at the operator's hand. It showed that substantially higher vibration levels are produced at the chisel of a chipping hammer than at its handle. Typical weighted values ...

Elastase, a specific inflammatory parameter of polymorphonuclear (PMN) granulocytes, was quantified with a sensitive enzyme immunoassay in the ejaculates of 188 patients consulting the andrological outpatient service. Correlations of the elastase concentrations to other parameters used up to now for the diagnosis of silent male genital tract inflammation were statistically ...

Fasting gastric pH (acidity) was measured over a 10-hour period in six patients with duodenal ulcer disease. Fasting pH was measured in a control study during which no medications were administered and in response to 300 mg of intravenous cimetidine given every 6 hours or 50 mg of intravenous ranitidine ...

Synthesis and bioassay of about 65 analogs of substance P (SP) over five years yielded the antagonist [D-Arg1,D-Trp7,9,Leu11]-SP, which was named Spantide, and which was used by many investigators as a "tool". Spantide served as a reference antagonist for the design of 47 new peptides toward the goal of more ...

It is a widely accepted opinion that some of the spots produced on the forearm and hand by external compression of the brachial artery are the visible evidence of an intraosseous shunt in the humerus. These spots were first evaluated systematically by Bier in 1898. Additional studies were conducted by ...

The penetration into rabbit spinal cord of two nonionic contrast media, iohexol and metrizamide, and a reference tracer, technetium DTPA, were compared. The spinal subarachnoid space was perfused for 4 hours with a CSF solution to which technetium DTPA and either iohexol or metrizamide had been added. The contrast media ...

Industries that use fluoride-containing materials are usually aware of their toxicity and adopt adequate medical measures. It has been found that workers in factories who have not been considered as subjected to fluorine hazard and therefore have not been controlled had significantly elevated urinary fluoride levels. Most workers in a ...

Urine samples from subjects, who had been using phenol for treatment of chemical fiber in factories, were analysed for urinary phenyl sulfate (PhS) and phenyl glucuronide (PhG) by high-performance liquid chromatography (HPLC). The urinary levels of phenol metabolites (PhG and PhS) had a significant correlation with the environmental concentration of ...

Ninety-two patients with suspected unilateral deep venous thrombosis (DVT) in the lower limb were examined by thermography, plethysmography and phlebography. ROC analysis (Receiver Operating Characteristics) was used to evaluate discrimination thresholds and to compare thermography and plethysmography (four variables) with phlebography. The sensitivity of thermography, 85% (94% for out-patients), was ...

Ammonia concentrations were measured in the nests of farmed raccoon dogs (Nyctereutes-procyonoides Gray, 1834) and polecats (Mustela putorius) at weaning time. Ammonia levels in the nests of raccoon dogs and polecats varied from 1 to 43 ppm and from 0 to 5 ppm, respectively. In the raccoon dog, with increasing ...

Twelve healthy white male volunteers participated in a randomized double-blind cross-over study to compare the bio-availability of four brands of furosemide marketed in the RSA. A 40 mg tablet of each of the following formulations, purchased at random, was administered: Aquasin; Furetic; Lasix; and Puresis. Blood specimens were taken up ...

In the Netherlands both Portland cement and blast furnace cement (slags from blast furnaces with about 30% Portland cement) are used for concrete. Radon exhalation measurements were carried out on concrete blocks made with these two types of cement and blocks with 15, 25 and 35% of the cement substituted ...

Total sulfur abundances have been measured for 48 achondrites. For twenty eucrites they ranged from 370 to 3700 micrograms S/g with a median sulfur content of 1180 micrograms S/g. Sulfur abundances for howardites ranged from 1490 to 3240 micrograms S /g and had a median sulfur concentration of 2340 micrograms ...

In a separate lipid intervention clinic integrated within the framework of a multiphasic preventive medical population program in Malmö, 401 of 2431 screening attenders in a male birth-year cohort born in 1927 and 1928 had elevated values of triglyceride and/or cholesterol. Hypertriglyceridemia was more than three times as frequent as ...

Critical review of the current medical literature shows lack of complete evaluation of the parameters of "medical decision making" in the sonographic diagnosis of infantile hypertrophic pyloric stenosis (IHPS). A computer program was specially written to calculate these parameters on three published series of patients with IHPS, using originally advocated ...

The turbidimetric analysis of IgG(T) in the serum of horses is described. Reference values are provided for 'worm-free' ponies (2.6 +/- 0.7 g/litre), stabled Thoroughbreds two years old and over (4.1 +/- 1.3 g/litre), grazing Thoroughbred broodmares (7.1 +/- 2.4 g/litre) and regularly wormed adult and young ponies grazing pasture ...

Tocographic monitoring of 21 patients with grade III abruptio placentae revealed the following: the tocographic pattern can be of diagnostic aid; the tocograph is of no value in measuring progress, because there is no significant change in uterine tone and contraction frequency and amplitude from the time the membranes are ...

Microcytic, hypochromic anaemia is a feature of aluminium toxicity. To detect the possible influence of aluminium on erythropoiesis in a general haemodialysis population we studied the evolution of red blood cell parameters and aluminium status in 30 patients (27 without aluminium toxicity symptoms). Aluminium status was assessed by serum aluminium ...

We have studied the effect of indican on six commercial procedures for the measurement of total bilirubin in serum. Total bilirubin measured by the Bilirubin A-Gent (Abbott) 2,4-dichlorophenyl diazonium procedure increased by 50 mg/L for each 1 mmol/L of added indican. Similarly, total bilirubin measured by the Bilirubin C-System (Boehringer ...

A biological monitoring programme has been developed for assessing occupational exposure to 4,4'-methylenebis (2-chloroaniline) (MBOCA) in a factory which manufactures polyurethane elastomers. In a systematic programme of biological monitoring over a five year period urinary MBOCA concentrations have been used to provide evidence of absorption of MBOCA. Improvements in the ...

Unilateral endolymphatic hydrops was created in guinea pigs by endolymphatic duct obstruction. Using microelectrodes, studies of endocochlear potential (EP) and inner ear ionic concentrations were performed. EP was significantly decreased whereas Na+, K+, and Cl- concentrations in both scala media and scala tympani were not significantly altered. The presence of ...

Several commercial radioimmunoassay kits are now marketed specifically for determination of thyrotropin (TSH) from whole-blood specimens collected on filter paper in neonatal screening programs. We have compared five kits in use in such screening programs in the United States. The reagent kits from Becton Dickinson, Neometrics, and Nuclear Medical Systems ...

The role of respondents' values in their evaluation of and satisfaction with medical care was explored in four health education settings. Two hundred and twenty-seven nursing, medical, and health psychology students completed a forced-choice instrument designed to measure their value preferences for technical quality of care, psychosocial concern, courtesy, and ...

Chronic deep venous insufficiency of the lower extremity, usually the result of antecedent venous thrombosis, represents a problem of considerable magnitude for both patient and physician. While the fully developed postphlebitic syndrome is immediately recognized by the most inexperienced medical student, the exact underlying pathogenetic mechanisms remain controversial, available therapeutic ...

Laser nephelometry is a technique which allows the evaluation of the concentration of several serum proteins and clotting factors. By means of this technique it is also possible to study the kinetics of the reaction between antigen and antibody. We studied the kinetics of the reaction between prothrombin and an ...

The numerical keratinocyte to melanocyte relation was studied in café au lait spots and adjacent normally pigmented skin of 9 patients with classical neurofibromatosis. Compared to normal skin of healthy individuals, the keratinocyte:melanocyte ratio distributions obtained in neurofibromatosis indicated a shift to lower values in the biopsies of café au ...

Time variation of radon daughters concentration in snowfall was measured continuously. The relations of radon daughters concentration in snowfall to the precipitation and to atmospheric radon daughters concentration were investigated. It has become clear that when precipitation is small, radon daughters concentration in snowfall is distributed in a wide range, ...

The haemoglobin (Hb), packed cell volume (PCV) and erythrocyte sedimentation rate (ESR) of healthy medical students, resident medical staff and student nurses were determined. Of the 163 males and 193 females studied for Hb and PCV, the mean Hbs were 15.2 and 13.8 g/dl respectively and the mean PCVs were ...

This article explores the analytical inaccuracies of routinely performed leukocyte differentials and cites the known biologic and personal physiologic variability in the total leukocyte counts and the leukocyte differential. The clinical value of leukocyte differentials in patients without hematologic disease is assessed on the basis of reports in the existing ...

The design of a sterilizer for sterilization of heat sensitive items using gaseous formaldehyde and steam is described. The sterilizer is able to create a constant formaldehyde-steam concentration over a period of at least one hour. It is further able to operate at formaldehyde concentrations close to saturation with only ...

Selenium concentration values for human urine samples are presented, and the literature on the chemical species of the element in urine is critically reviewed. Daily excretion levels in healthy persons and in pathological or experimental conditions are compiled. Medical implications and the significance of urinary selenium determination in assessing the ...

Basic haematological values were measured in 50 individuals of five species falling under the subfamily Reduncinae, including the mountain reedbuck (Reduncula fulvorufula), the eastern waterback (Kobus ellipsiprymnus ellipsiprymnus), the defassa waterbuck (Kobus ellipsipyrmnus defassa), the lechwe waterbuck (Kobus leche) and the Lady Gray's waterbuck (Kobus megaceros) and in 45 animals ...

A series of 84 medical inpatients were treated in random order with oral digoxin in doses calculated according to the newly introduced Nicholson score and the Jellife formula and nomogram. The daily dose of digoxin was lower (p less than 0.01) according to the Nicholson score (mean 2.1 digoxin tablets ...

Rolled bilateral palm impressions of 148 unrelated Nukadora individuals in Visakhapatnam District of Andhra Pradesh have been studied. Mainline formula 9.7.5 is found to be predominant and the mainline index shows higher values on the right than the left palm. The frequency of true patterns is found to be higher ...

This study has demonstrated an imbalance between the blood proteolytic and antiproteolytic system in acute pancreatitis. Serum elastase activity is markedly increased and elastase inhibitory capacity is decreased in this disease as compared with those in chronic pancreatitis and the control values. We have found that a return to normal ...

The effect of pentoxifylline on the deformability of red cells in sickle cell thalassaemia was investigated. The fluidity of the blood in sickle cell thalassaemia is disturbed and is accompanied by violent pains and irreversible tissue damage caused by capillary occlusions. After treating a 15-years-old female patient with pentoxifylline (2 ...

Twenty-four-hour urine samples were collected from 179 male and female medical students in Ibadan, and 112 medical students in Zaria. The values for 24-h urine volume, urinary electrolytes, urea and creatinine exhibited a skewed distribution and were normalized by logarithmic transformation. The geometric means values for the 24-h urine volume ...

The authors used a sensitive flameless atomic absorption spectrophotometric procedure to measure CSF copper concentrations in normal controls, former heroin addicts, and unmedicated and medicated chronic schizophrenic patients and found no significant differences in CSF copper levels between these groups. Schizophrenic women had significantly lower CSF copper levels than schizophrenic ...

Bluegills (Lepomis macrochirus Raf.) were exposed to [14C]anthracene or [14C]benzo[a]pyrene (B[a]P) in water. Rates of uptake and biotransformation within the fish were followed by 14C counting and thin-layer and liquid chromatography. The initial uptake-rate coefficient for anthracene (KU = 36 hr-1) was found to be independent of exposure concentration. The ...

The concentrations of dihydroxyacetone phosphate (DHAP), glycerol-3-phosphate (GP), glucose and alkylglycerols were measured in bovine colostrum and milk. Concentrations of GP were higher in colostrum than in milk, and corresponded to intracellular concentrations at the onset of lactation. This suggests that GP equilibrates over the apical membrane at onset of ...

A modified neurodevelopmental assessment technique, the KEH scale, was applied to 60 healthy newborn infants at 2 - 4 hours of age, and again at 24 hours in order to detect any effect of maternal medication on behaviour. Results show that neonates whose mothers received medication during labour were significantly ...

We studied the effects of chloramphenicol (CAP), nitroso-chloramphenicol (NO-CAP) and thiamphenicol (TAP) on methemoglobin (MeHb) formation in vitro in hemolyzed blood. At concentrations of 0.5 to 10 mM CAP and TAP did not have any effect on hemoglobin. On the other hand, NO-CAP at 0.25 to 5 mM caused both ...

The seasons in the 1 year study were classified as rainy, transitional rainy-dry, dry, and transitional dry-rainy. Semen pH and the consistency of the testes did not vary between seasons or among rams. All other characteristics of semen and testis varied between rams. Significant seasonal differences were observed for ejaculate ...

The admission chest radiographs of 824 were screened for the presence of bilateral pleural thickening. Those patients with pleural thickening were scored according to the ILO classification of radiographs of the pneumoconioses. The prevalence of bilateral pleural thickening was high (6.2%) in these patients, of whom 67% had an environmental ...

Having oxidized 3,4-dihydroxyphenylalanine (dopa) with sodium periodate or mushroom tyrosinase in a pH range from 3.5 to 6.0, it has been possible to detect spectrophotometrically 4-(2-carboxy-2-aminoethyl)-1,2-benzoquinone with the amino group protonated (o-dopaquinone-H+), a postulated intermediate in the melanogenesis pathway. When the pH value was greater than 4, the final product ...