abstract：:Many thousand organic compounds are in common use and new ones introduced daily. With many of these materials, little is known about their toxic hazard. For years scientists have been investigating the relation of structure and properties to biological activity. Among the factors relating to toxicity are bioaccumulati...

journal_title：Environmental health perspectives

authors： Freed VH,Chiou CT,Schmedding D,Kohnert R

更新日期：1979-06-01 00:00:00

abstract：:The rapid development of the chemical industry, combustion of fossil fuels, and smoking of tobacco have resulted in contact of the general population with benzo(a)pyrene and other carcinogenic aromatic hydrocarbons. Persons especially at risk occupationally are those engaged in thermal processing of oil shale, coal, a...

journal_title：Environmental health perspectives

authors： Pashin YV,Bakhitova LM

更新日期：1979-06-01 00:00:00

abstract：:This subject concerns the complex interrelationship of a genetically determined protein deficiency, enzymes which are inhibited by that protein, environmental challenges such as cigarette smoke and industrial pollutants, and the occurrence of obstructive lung disease (Fig. 1). Unequivocal establishment of an etiologic...

journal_title：Environmental health perspectives

authors： Evans HE,Bognacki N

更新日期：1979-04-01 00:00:00

abstract：:The populations of the developed nations of the world exhibit an increase in blood pressure with age, while in primitive societies blood pressure remains relatively constant throughout adult life. Hypertension may be a complex of diseases all having the same clinical manifestations but not being caused necessarily by ...

journal_title：Environmental health perspectives

authors： Tuthill RW,Calabrese EJ

更新日期：1979-04-01 00:00:00

abstract：:Dietary vitamin E affects the susceptibility of mice and rats to ozone and nitrogen dioxide, suggesting a free radical mechanism of toxicity. Conventional peroxidation does not completely explain the effects of alterations of lung fatty acid composition on both nitrogen dioxide and ozone toxicity. A new scheme is prop...

journal_title：Environmental health perspectives

authors： Menzel DB

更新日期：1979-04-01 00:00:00

abstract：:The discovery of the potent mutagenicity of AF-2, which was once used in Japan as a food preservative, has exerted a great influence not only on screening procedures for carcinogenic compounds but also on legislative approaches to mutagenic substances. It promoted the synthesis of exceedingly sensitive and reliable te...

journal_title：Environmental health perspectives

authors： Tazima Y

更新日期：1979-04-01 00:00:00

abstract：:The study reported here presents the results of an investigation of a marsh-cove ecosystem heavily contaminated by cadmium. The most contaminated aquatic sediments were dredged in 1972-73, but the resuspension of the sediments and recycle of water from the dredge spoil resulted in reestablishment of a large contaminat...

journal_title：Environmental health perspectives

authors： Kneip TJ,Hazen RE

更新日期：1979-02-01 00:00:00

abstract：:This study was undertaken to explore the effects of chronic low-level cadmium ingestion in Dahl hypertension-resistant (R) and hypertension-sensitive (S) lines of rats. Groups of weanling female R and S rats were given 0 or 1 mg cadmium/1. in drinking water and fed either a low salt (0.4% NaCl) or a high salt (4% NaCl...

journal_title：Environmental health perspectives

authors： Ohanian EV,Iwai J

更新日期：1979-02-01 00:00:00

abstract：:The main source of cadmium in the diet is cereal or meat, especially in liver and kidney. Since the cadmium in both liver and kidney is bound to metallothionein, a heat-stable protein, the gastrointestinal absorption and metabolism of cadmium metallothionein (CdMt) was studied in detail. The selective renal cadmium de...

journal_title：Environmental health perspectives

authors： Cherian MG

更新日期：1979-02-01 00:00:00

abstract：:The Tradescantia genetic system developed by the late Dr. Arnold H. Sparrow for the study of effects of ionizing radiation is applicable to chemical mutagen detection. Early radiobiological data demonstrated that the stamen hairs were sensitive to as little as 0.25 rad of x-rays and that the number of cells showing a ...

journal_title：Environmental health perspectives

authors： Schairer LA,Van't Hof J,Hayes CG,Burton RM,de Serres FJ

更新日期：1978-12-01 00:00:00

abstract：:A brief overview is given of the sources, characteristics, and toxic constituents of municipal solid wastes. Several methods are presented for handling, treating, and disposal of solid wastes. Monitoring the landfill site is necessary; there has been a trend to recognize that municipal solid wastes may be hazardous an...

journal_title：Environmental health perspectives

authors： Stone R

更新日期：1978-12-01 00:00:00

abstract：:During the last three decades, the use of modern organic synthetic pesticides has increased about 40-fold. Total U.S. production, for domestic and expert use, in 1976 was about 1.4 million pounds. Crops receiving the most intensive application of various pesticides were cotton for insecticides, corn for herbicides, an...

journal_title：Environmental health perspectives

authors： Ridgway RL,Tinney JC,MacGregor JT,Starler NJ

更新日期：1978-12-01 00:00:00

abstract：:Large quantities of food processing, crop, forestry, and animal solid wastes are generated in the United States each year. The major components of these wastes are biodegradable. However, they also contain components such as nitrogen, human and animal pathogens, medicinals, feed additives, salts, and certain metals, t...

journal_title：Environmental health perspectives

authors： Loehr RC

更新日期：1978-12-01 00:00:00

abstract：:A wide variety of behavioral methods has been employed with animals to assess visual changes induced by drugs or toxicants. The methods range from simple to complex, from broad screening devices to narrowly focused techniques. Their relative advantages for the environmental toxicologist are discussed. Manipulation of ...

journal_title：Environmental health perspectives

authors： Evans HL

更新日期：1978-10-01 00:00:00

abstract：:The neurochemical basis of memory has been approached experimentally in four different ways: the bioassay; the interventive approach; the interventive-correlative approach; and the correlative approach. These approaches are fundamentally similar to those used for the study of the chemistry of any behavior. Each of the...

journal_title：Environmental health perspectives

authors： Dunn AJ

更新日期：1978-10-01 00:00:00

abstract：:We have witnessed a tremendous increase in our knowledge of the molecular and biochemical mechanisms which underly the activities of the nervous system. Such knowledge is essential in order to determine the basic mechanisms involved in neurotoxic events. An overview of how neurotoxins could conceivably interfere with ...

journal_title：Environmental health perspectives

authors： Damstra T

更新日期：1978-10-01 00:00:00

abstract：:A series of experiments is described in which operant methodology is used to study the effects of drugs on "learning." Emphasis is placed on the technique of repeated acquisition as a behavioral baseline for studying this type of transition state. In this technique, each subject is required to learn a new discriminati...

journal_title：Environmental health perspectives

authors： Thompson DM,Moerschbaecher JM

更新日期：1978-10-01 00:00:00

abstract：:Acute exposures to isobutane, propane, F-12, and F-11 in concentrations of 250, 500, or 1000 ppm for periods of 1 min to 8 hr did not produce any untoward physiological effects as determined by the methods employed which included serial EKG's and continuous monitoring of modified V5 by telemetry during exposure. Repet...

journal_title：Environmental health perspectives

authors： Stewart RD,Newton PE,Baretta ED,Herrmann AA,Forster HV,Soto RJ

更新日期：1978-10-01 00:00:00

abstract：:The available data on the influence of selenium on the toxicity of methylmercury and of methylmercury on selenium as a nutrient and toxic agent are reviewed. Selenium as selenite has a relative protective effect on acute and subacute toxicity of methylmercury in the rat and the quail. The protective mechanism is far f...

journal_title：Environmental health perspectives

authors： Skerfving S

更新日期：1978-08-01 00:00:00

abstract：:A brief review of the literature indicates that nutritional deficiencies have been shown to increase the absorption and toxicity of orally ingested lead and cadmium. Results from recent studies indicates that low level oral ingestion of cadmium and lead perturbs the metabolism of zinc, copper, and iron and that these ...

journal_title：Environmental health perspectives

authors： Petering HG

更新日期：1978-08-01 00:00:00

abstract：:In recent years, exposure of man to increasing amounts of metals has occurred rather generally from industrial contamination and variably from intake of dietary mineral supplements. Adverse effects of individual metals can be markedly altered by dietary levels of other essential and nonessential inorganic elements, es...

journal_title：Environmental health perspectives

authors： Fox MR

更新日期：1978-08-01 00:00:00

abstract：:Cytotoxic chemicals have in common the ability to act specifically on cells in cycle. Bacteria are more sensitive in the exponential growth phase than when growing slowly in media. Similar observations have been made on a variety of systems ranging from bacteria, yeast, higher plants and invertebrates to vertebrates i...

journal_title：Environmental health perspectives

authors： Harbison RD

更新日期：1978-06-01 00:00:00

abstract：:Chemicals, including commonly used drugs (e.g., penicillin, meprobamate, pyridium, and mercaptomerin) penetrate and persist for some time in the ovarian follicular fluid at concentrations approximately similar to that of the serum. Information as to the penetration of chemicals into the granulosa cells and into the oo...

journal_title：Environmental health perspectives

authors： Fabro S

更新日期：1978-06-01 00:00:00

abstract：:To study the effect of processing on polybrominated biphenyl (PBB) levels, milk from four dairy herds containing less than 0.3 ppm (fat basis) of physiologically incorporated PBBs was presented individually into cream, skim milk, butter, and stirred curd cheese. Pasteurized and freeze-dried whole milk, skim milk, and ...

journal_title：Environmental health perspectives

authors： Zabik ME,Johnson TM,Smith S

更新日期：1978-04-01 00:00:00

abstract：:Pregnant Sprague Dawley rats were given 0, 0.25, 0.5, 1, 5, and 10 mg of a commercial polybrominated biphenyl, FireMaster BP-6 (PBB), in olive oil by gavage each day from days 7 through 15 of pregnancy. Laboratory chow and water were given ad libitum. Treatment with PBB had no significant effect on body weight gain, f...

journal_title：Environmental health perspectives

authors： Harris SJ,Cecil HC,Bitman J

更新日期：1978-04-01 00:00:00

abstract：:Studies were performed to investigate the effects of FireMaster FF-1, a chemical fire retardant consisting of a mixture of polybrominated biphenyls (PBB), on immune functions in mice and rats. Animals received 22 daily treatments of 0.03, 0.3, 3.0, or 30 mg PBB/kg body weight in a period covering 30 days. PBB exposure...

journal_title：Environmental health perspectives

authors： Luster MI,Faith RE,Moore JA

更新日期：1978-04-01 00:00:00

abstract：:Polybrominated biphenyls (PBBs) cause a mixed-type (phenobarbital- plus 3-methylcholanthrene-like) induction of liver microsomal drug metabolizing enzymes in rats. However, 2,2',4,4',5,5'-hexabromobiphenyl and 2,2',3,4,4',5,5'-heptabromobiphenyl, which together comprise less than 80% of PBBs (FireMaster), were shown t...

journal_title：Environmental health perspectives

authors： Moore RW,Dannan GA,Aust SD

更新日期：1978-04-01 00:00:00

abstract：:Soil samples were collected from 28 fields which had received manure from Michigan's most highly contaminated dairy herds. The number of fields in each concentration range of PBB in soil were: 2, not detectable; 15, 0.0 to 8.0 ppb; 6, 14-102 ppb, and 5, 153 to 371 ppb. Plant tissue sampled from the 10 most highly cont...

journal_title：Environmental health perspectives

authors： Jacobs LW,Chou SF,Tiedje JM

更新日期：1978-04-01 00:00:00

abstract：:The metabolism of polybrominated biphenyls (PBBs) was studied in vitro by using rat liver microsomes in the presence of NADPH and atmospheric O2. Quantitative recoveries of all PBBs were obtained after incubations with control or 3-methylcholanthrene (MC) induced microsomes. Of the twelve major components, losses of o...

journal_title：Environmental health perspectives

authors： Dannan GA,Moore RW,Aust SD

更新日期：1978-04-01 00:00:00

abstract：:This working paper summarizes the known ultrastructural and biochemical effects of lead, mercury, cadmium, and arsenic on subcellular organelle systems following in vivo administration. Documented metal-induced alterations in nuclear, mitochondrial, microsomal, and lysosomal functions are discussed in relation to thei...

journal_title：Environmental health perspectives

authors： Fowler BA

更新日期：1978-02-01 00:00:00

abstract：:Elucidation of the role of vinyl chloride metabolites in the various reaction sequences which comprise the metabolic pathway, including the interaction of reactive metabolities with some purine and pyrimidine residues of target-organ DNA, provides some explanation for the (oncogenic) properties associated with the ori...

journal_title：Environmental health perspectives

authors： Hathway DE

更新日期：1977-12-01 00:00:00

abstract：:A patient with massive exposure to tetrachloroethylene fumes presented with coma and severe pulmonary edema. Sequential blood gases, chest x-rays, and clinical findings showed dramatic improvement with conventional but aggressive management and the patient recovered completely. There was no evidence of permanent renal...

journal_title：Environmental health perspectives

authors： Patel R,Janakiraman N,Towne WD

更新日期：1977-12-01 00:00:00

abstract：:Mortality curves for groups of fasted male rats treated with single, oral doses of 1,1-dichloroethylene (1,1-DCE, vinylidene chloride) were not monotonically increasing sigmoids, but were complex with maxima or extended plateaus in the region of dose between 100 and 700 mg of 1,1-DCE/kg. The exact shape was a function...

journal_title：Environmental health perspectives

authors： Andersen ME,Jenkins LJ Jr

更新日期：1977-12-01 00:00:00

abstract：:The ability of a series of haloalkanes, haloethanols and haloacetaldehydes to induce mutations in Salmonella typhrimurium and preferentially to inhibit the growth of DNA polymerase-deficient E. coli (pol A(+)/pol A(-)) was investigated. For the haloalkanes investigated, the order of reactivities towards the E. coli po...

journal_title：Environmental health perspectives

authors： Rosenkranz HS

更新日期：1977-12-01 00:00:00

abstract：:Until recently, mutagenicity testing was done on preselected compounds in a manner in which the testing laboratories knew the identity of the substances under test and the "expected" results, i.e., positive for compounds selected because of their carcinogenicity and negative for food additives. There is no completed s...

journal_title：Environmental health perspectives

authors： Valcovic LR

更新日期：1977-10-01 00:00:00

abstract：:In many instances pharmacokinetic modeling offers the best method of interpreting the significance to man of results obtained with laboratory animals but first we must have accurate models for our laboratory animals. A physiological pharmacokinetic model has been used to simulate the disposition of polychlorinated bip...

journal_title：Environmental health perspectives

authors： Matthews HB,Tuey DB,Anderson MW

更新日期：1977-10-01 00:00:00

abstract：:Methylcobalamin (methyl-B12) has been implicated in the biomethylation of the heavy metals (mercury, tin, platinum, gold, and thallium) as well as the metalloids (arsenic, selenium, tellurium and sulfur). In addition, methylcobalamin has been shown to react with lead, but the lead-alkyl product is unstable in water. D...

journal_title：Environmental health perspectives

authors： Ridley WP,Dizikes L,Cheh A,Wood JM

更新日期：1977-08-01 00:00:00

abstract：:In these studies the effects of ingested arsenic (As(+5)) on hepatic heme biosynthetic capability and hemoprotein function in adult male rats were investigated. Animals exposed for 6 weeks to 0, 20, 40, or 85 ppm sodium arsenate in the drinking water suffered depression of hepatic delta-aminolevulinic acid (ALA) synth...

journal_title：Environmental health perspectives

authors： Woods JS,Fowler BA

更新日期：1977-08-01 00:00:00

abstract：:The purpose of the investigation is to study whether an increased mortality from certain causes exists in an area around the Rönnskärsverken smelter works in northern Sweden. Founded in 1928, this metallurgical plant processing mainly nonferrous metals has since its initial operations been using ore with a high arseni...

journal_title：Environmental health perspectives

authors： Pershagen G,Elinder CG,Bolander AM

更新日期：1977-08-01 00:00:00

abstract：:The timing of some key embryological events is given for man, rat, chick, and certain other animals. Such times, however, are approximations, and variations occur among members of the same strain and even among members of the same litter. Some differences in developmental patterns are indicated. ...

journal_title：Environmental health perspectives

authors： Monie IW

更新日期：1976-12-01 00:00:00