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evolutionary studies on the distribution and dynamics of melanism in the hamster (cricetus cricetus l.). i. distribution of black hamsters in the ukrainian and bashkirian soviet socialist republics (u.s.s.r.). 194517247154
evolutionary studies on the distribution and dynamics of melanism in the hamster (cricetus cricetus l.). ii. seasonal and annual changes in the frequency of black hamsters. 194517247155
[function of the nervous system in hibernating animals. differences between the behavior of the common hamster (cricetus frumentarius) and the spermophile (citellus citellus)]. 195114896610
[studies on blood composition and its relations to autonomic tonicity in hamster cricetus cricetus l; physiology of hibernation]. 195313137154
[critical thermal increment of respiration in vitro of the renal tissue of white rat and of hamster cricetus cricetus]. 195413200029
[critical thermal increment of respiration in vitro of the renal tissue in cricetus cricetus during non-hibernating state in the summer and during hibernating state in the winter]. 195413200032
[participation of the endocrine glands in function reactions of the lymphocyte and neutrophil picture in a hamster (cricetus cricetus l.)]. 195613325601
[study of gonadotrophic activity of the anterior pituitary gland of the hamster (cricetus cricetus) in winter and summer]. 195613427295
[the role of the field hamster (cricetus cricetus) as of a source of infection of the swamp-field fever]. 195713434259
[hibernation & the adrenals: research with the common hamster cricetus cricetus]. 195713500714
[gonadotropic activity of the anterior pituitary in hamster (cricetus cricetus) during the course of the year]. 195713500719
[comparative nuclear volumetric investigation in cricetus cricetus, cricetulus barabensis griseus & the presumably tetraploid mesocricetus auratus (gold hamster)]. 195813558423
[seasonal variations of reaction threshold of the thyroid to thyrostimuline in hamster (cricetus cricetus)]. 195813550199
[respiratory exchanges of the common hamster (cricetus cricetus) & of the dormouse (eliomys quercinus) in hibernation]. 195913663389
[seasonal evolution of the urinary elimination of 17-ketosteroids and formaldehydrogenic steroids in the hamster (cricetus cricetus)]. 196013752051
[glycolysis and oxygen consumption by slices of different tissues from the white rat and the common hamster (cricetus cricetus)]. 196114483599
[study with the electron microscope of the parathyroid of the common hamster (cricetus cricetus) in an organotypical culture]. 196114037387
[on the behavior of the blood sugar in hibernation and hypothermia in the hamster (cricetus cricetus l.)]. 196113739737
[on serum sodium, potassium and calcium in the hibernating and hypothermic hamster (cricetus cricetus l.)]. 196214490532
[effect of the intratesticular adrenal graft from the newborn hamster (cricetus cricetus) on the hibernation of the adult adrenalectomized hamster (cricetus cricetus)]. 196214454684
[effect of a stay at a low temperature associated with darkness on the early appearance of hibernation in the hamster (cricetus cricetus)]. 196214454685
[ultrastructural changes of the male hamster (cricetus cricetus) parathyrroid after castration]. 196313972340
[behavior of calcified tissue of the european hamster cricetus cricetus during hibernation]. 196314081609
[ultrastructural study of the adrenal cortex in a hibernant, the common hamster (cricetus cricetus), during the seasonal cycle]. 196414219859
[ultrastructural variations of the adrenal cortex during the seasonal cycle in a hibernant, the common hamster (cricetus cricetus)]. 196414250581
[seasonal calcium balances in a hibernant, the european hamster (cricetus cricetus)]. 196414262546
[the eliminination of urea in hibernants during winter, spring and summer. study on the european hamster, cricetus cricetus]. 196414282143
[effect of temperature on the degree of hydration and na and k content of sections of rat and hamster renal cortex slices. (cricetus cricetus)]. 19655856244
[experimental infection of the hamster (cricetus cricetus) per os by the vegetative form and the cystic form of toxoplasma gondii]. 19655840745
[influence of the outside temperature on the elimination of urinary catecholamines in hamsters (cricetus cricetus)]. 19664224550
[suppression of hibernation and modification of thermoregulation by hypothalamic lesions in the european hamster, cricetus cricetus]. 19664225216
[seasonal cycle of urinary elimination of aldosterone in a hibernant, cricetus cricetus. influence of temperature]. 19664225217
[dna replication pattern of somatic chromosomes of cricetus cricetus (l)]. 19666012391
[seasonal variations of sodium and potassium excretion in the european hamster (cricetus cricetus)]. 19674234196
[seasonal development in the excretion of adrenal hormones in a hibernating animal, cricetus cricetus]. 19674862626
[ultrastructure of the parafollicular cells of the wild hamster (cricetus cricetus)]. 19674169213
[histological studies on the secretory activity of submandibular gland in the field hamster (cricetus cricetus l.) during the summer activity period and during hibernation]. 19684174987
[synthesis of steroids beginning with na-1-14c acetate by wild hamster (cricetus cricetus l.) adrenal cortex and brown fat in organ culture]. 19685753780
[elimination of urinary corticosteroids by european hamster (cricetus cricetus) adrenalectomized and bearing an intratesticular adrenal homograft]. 19685734909
[hypothalamic control of thermoregulation and of hibernation in the european hamster cricetus cricetus]. 19695800001
[thermoregulation in ambiant heat of a hibernant, the european hamster (cricetus cricetus). comparison with the white rat]. 19695806365
[taxonomy and distribution of the eurasian common hamster (cricetus c. cricetus l., 1758) in slovakia]. 19695393221
[seasonal development of calcium balance in a hibernant, the european hamster (cricetus cricetus)]. 19694238657
[effects of radiothyroidectomy and to thyroid hormone injections on the beginning of hibernation of the european hamster (cricetus cricetus)]. 19704252377
[circadian rhythm of thermogenesis in the waking and active european hamster (cricetus cricetus) at the end of summer]. 19704250424
[study of urinary elimination of catecholamines in the thyroidectomized european hamster (cricetus cricetus) during chronic or brief exposure to cold]. 19715155689
[attempted identification, by means of radioactive precursors, of a steroid type compound synthetized and excreted by the brown fat of the european hamster (cricetus cricetus)]. 19724654467
[role of thyroxine in the initiation of hibernation and resistance to cold in eureopean hamsters (cricetus cricetus) thyroidectomized in spring]. 19724675632
energy requirement and coefficient of utilization of food in the common hamster and water rat. 19724668839
does brown adipose tissue of the european hamster (cricetus cricetus) store and synthetesize corticosteroids? the isolation of a corticosteroid-like compound. 19725085218
a study of golden hamster (cricetus cricetus) alkaline phosphatase isoenzymes. 19734747103
demonstration of nitrosamine-induced tumours in the respiratory tract of the european hamster (cricetus cricetus l.) by x-ray examination. 19734761819
comparative studies of organs in the european hamster (cricetus cricetus l.), the syrian golden hamster (mesocricetus auratus w.) and the chinese hamster (cricetulus griseus m.). 19734779674
[circannual weight rhythm of the european hamster (cricetus cricetus). respective influence of the photoperiod and external temperature during its course]. 19734780670
[determination of possible corticosteroids in the brown fat of the european hamster (cricetus cricetus). identification of compounds isolated by gas chromatography and mass spectrum analysis]. 19734211385
comparative histometric investigations of the testicular function of european hamsters (cricetus cricetus) with and without hibernation. 19734725608
[ the european hamster (cricetus cricetus) as a new experimental host of schistosoma mansoni. study of the effects of hibernation]. 19734801916
[role of the thyroid and gonads in determination of the annual weight cycle of the european hamster (cricetus cricetus)]. 19744470407
[effects of photoperiod and ambient temperature on circannual rhythms of body weight and adrenal cortex activity in european hamster (cricetus cricetus)]. 19744469775
anatomical investigations of the cranium of the european hamster (cricetus cricetus l.) with particular consideration to the nasal and paranasal cavities. 19744824479
the european hamster (cricetus cricetus l.) as an experimental animal: breeding methods and observations of their behaviour in the laboratory. 19744824484
carcinogenic effects of n-nitrosomorpholine and n-nitrosopiperidine on european hamster (cricetus cricetus). 19744835109
the carcinogenic effects of dimethylnitrosamine and nitrosomethylurea in european hamsters (cricetus cricetus l.). 19744369271
carcinogenic effect of dibutylnitrosamine in european hamsters (cricetus cricetus). 19744412319
[natural latent infection of the european hamster ("cricetus cricetus", linné) with a papovavirus. i. isolation of virus in golden hamster and new-born mice (author's transl)]. 19744425201
bronchographic studies of the european hamster (cricetus cricetus l.), the syrian golden hamster (mesocricetus auratus w.) and the chinese hamster (cricetulus griseus m.). 19744446850
[demonstration of gap junctions or nexus by lanthanum in the brown fat of the european hamster (cricetus cricetus)]. 19744211377
[cardiovascular reflex-reactions on the blood volume changes before and after pharmacological elimination of the efferent heart innervation].reflex changes in the heart frequency, blood pressure and respiratory frequency induced by slow changes of the blood volume are observed in the aesthetized european hamster (cricetus cricetus l.). tachycardia, hypertension and hyperpnoe occured during intravenous infusion and bradycardia, hypotension and respiratory inhibition during hemorrhages or local distensions of the junction between the superior vena cava and the right atrium. various receptor organs of the heart and the great vessels and ...19751221737
comparative studies of blood from hibernating and nonhibernating european hamsters (cricetus cricetus l).the blood of 6 male and 6 female european hamsters (cricetus cricetus l) was examined in summer, in winter before hibernation, and 1 da after awaking from hibernation. blood was drawn from a sublingual vein under ether anesthesia in nonhibernating animals. no influence of hibernation upon the number of erythrocytes and the differentials was found, whereas the number of thrombocytes and leukocytes were reduced to a minimum. from the unchanged numbers of thrombocytes and leukocytes in nonhibernati ...19751134037
[new data on the genetic structure of dimorphic populations of the common hamster (cricetus cricetus l.)].long-term (1965-1974) mendelian crossbreedings of two coloured forms (black and red) of cricetus cricetus, carried out by the author, have shown that dominant melanistic mutation exists in a homozygous state. thus, it is proved experimentally that natural population of c. cricetus consisting of black and red individuals is a dimorphous one by the phenotype and a polymorphous one by the genotype. the structure of the population includes the black homozygotes (genotype aa), black heterozygotes (ge ...19751228058
[effect of brain stem lesions on hibernation of the hamster (cricetus cricetus l.)].small lesions in the brain stem (including the hypothalamus) of the european hamster were effective with respect to food intake, hibernatory disposition and thermogenic power (oxygen consumption) as well. hyperphagia was accompanied by depression of hibernation mostly. moreover, hibernation was hindered by impairment of the thermogenic capacity. entrance into hibernation depended on the integrity of the middle and caudal hypothalamic areas and the rostral portions of the pons and midbrain. hyper ...19751199640
differences in blood values depending on age in laboratory-bred european hampsters (cricetus cricetus l.).no significant differences in blood parameters were found between males and females aged 13-900 days. a comparison of the various age groups showed significant differences in the number of erythrocytes, leucocytes, thrombocytes and in the diameter of red blood cells. the number of erythrocytes and leucocytes was lowest, and the erythrocytes had the largest diameteres in young animals. the number of thrombocytes was lowest in older animals.19751117694
a comparative analysis of the karyotypes of cricetus cricetus and cricetulus griseus.this study presents a comparison of the mitotic chromosomes of the two species of hamsters cricetus cricetus (european hamster) and cricetulus griseus (chinese hamster), which have the same chromosome number of 2n=22.--g-banding procedure reveals striking similarities in both karyotypes and gives the possibility to analyse structural changes so that two examples for robertsonian rearrangement can be observed.--a remarkable kind of difference between the two karyotypes becomes obvious after c-ban ...19761269344
[effects of temperature and light variations, and of radiothyroidectomy on body weight regulation in the european hamster (cricetus cricetus) (author's transl)].regain of body weight in european hamsters after fasting was investigated at various periods of the year and under different ambient conditions (fig. 1) with and without radiothyroidectomy. 1. weight gain after food deprivation proceeds at rates which vary with the season. it is faster in spring and summer than in winter. 2. variations in ambient temperature and in light conditions do not influence the daily weight gain and the relative rate of weight increase (fig. 2,3). 3. radiothroidectomy de ...19761011174
early x-ray detection of colonic and rectal tumours in european hamsters.three groups of european hamster (eh) (cricetus cricetus l.) were treated subcutaneously every two weeks for life with 1/10 or 1/20 ld50 dmh, while two other groups served as controls. twelve weeks after commencement of treatment, radiological examinations of the colon and rectum were begun. the double contrast method was used. in this way it was possible to detect the earliest neoplastic alteration to take place in the above sites. this occurred in the 26th treatment week and was diagnosed as a ...1976138278
studies of the ovaries of hibernating and non-hibernating european hamsters (cricetus cricetus). 1977612081
regional studies of brain serotonin and norepinephrine in the hibernating, awakening or active european hamster, cricetus cricetus, during winter. 197720276
studies on sex chromosomes of four hamster species: cricetus cricetus, cricetulus griseus, mesocricetus auratus, and phodopus sungorus.in this paper, we present an analysis of the sex chromosomes of four hamster species after application of different staining techniques. the mitotic x chromosomes show a striking similarity in g-banding pattern but rather great differences in their c-banding patterns. a presumably homologous euchromatic segment that exhibits two distinct g-bands appears in the x chromosome of each species. the y chromosome of cricetus cricetus is in contrast to those of the other species, because it reveals a re ...197767011
[experimental carcinogenesis in the respiratory tract using the european field hamster (cricetus cricetus l.) as a model].subcutaneous treatment of european hamsters with aliphatic (diethyl-, diisopropanol-,dibutylnitrosamine) and cyclic nitroso compounds (nitrosopiperidine, morpholine, and heptamethyleneimine) led to the development of respiratory tract tumors. most of the neoplasms were seen in the nasal cavity and lungs, although tumors were also found in the larynx and trachea. histologically, the tumors were diagnosed as papillary polyps, papillomas, adenomas, adenocarcinomas, squamous cell carcinomas and mixe ...1977914221
tumors of the heart and stomach induced in european hamsters by intravenous administration of n-methyl-n-nitrosourea.one hundred twenty captured european hamsters (cricetus cricetus l.) were inoculated iv with 1/5, 1/10, or 1/20 the median lethal dose of n-methyl-n-nitrosourea (mnu) once weekly for 18 weeks. mnu induced mainly sarcomas in the heart and squamous cell carcinomas and sarcomas in the stomach. the highest incidence of such tumors was demonstrated by the lowest-dosage group. they were more frequent in males than in females. the effect of mnu was also localized at the site of administration and resul ...1977864748
biological values of the european hamster (cricetus cricetus). 1977592718
[tularémia epidemic in humans in the region of east slovakia in 1972--connection with hamster (cricetus cricetus l.) overmultiplication (author's transl)]. 1978630568
the carcinogenic effect of dimethylnitrosamine in laboratory bred european hamsters (cricetus cricetus).the carcinogenic effect of dimethylnitrosamine (dmn) s.c. injected at two different dose levels was studied in laboratory bred european hamsters (eh) and data compared to findings for captured eh. malignant haemangioendotheliomas of the liver and kidney, hepatocellular carcinomas and cholangiocarcinomas were induced. in contrast to the results obtained with wild eh, a large number of the laboratory bred females additionally developed ovarian granulosa cell tumors.1978624110
the fine structure of ependyma in the hypothalamus of the hamster (cricetus cricetus).the ciliated ependyma of the hypothalamus of the hanster (cricetus cricetus) consists of a sheet of cells, the luminal surface of which is reflected over cilia and numerous microvilli. the lateral portions of the plasmalemma of contiguous cells are fused at some sites to from junctions of five layers, the zonula occludens. these fusions occur usually in continuity with other intercellular junctions, the zonula adhaerens. in the apical regions of the ependyma these fusions are almost spiralled. t ...1978697048
comparative studies on sindbis virus strains isolated in slovakia.two variants of sindbis virus strains were distinguished according to the dextran sulphate (ds) marker. large-plague strains freshly isolated from cricetus cricetus and rana ridibunda produced exclusively small plaques after ds treatment. the prototype sindbis virus strain produced both large and small plaques after ds treatment. kinetic haemagglutination-inhibition tests revealed a higher reactivity of freshly isolated strains than of the prototype strain. for differentiation of newly isolated ...197826202
[modification of the deep pineal after ablation of the superficial epiphysis in the golden hamster].in various species (among rodents: mesocricetus auratus, cricetus cricetus, mus musculus, meriones libycus, m. shawi et m. crassus; among cheiroptera: artibeus jamaicensis etc), the pineal complex is formed by two different portions one superficial situated under the cerebral dura and one deep portion situated between the habenular and posterior commissures. superficial and deep portions are separated by a tractus of fibers and some pineal cells. superficial epiphysectomy in the mesocricetus aur ...1979160816
anatomy of the nasal cavity of the european hamster (cricetus cricetus). 1979549379
bronchoscopy in the european hamster (cricetus cricetus).a pediatric bronchoscope was modified for use in the european hamster (cricetus cricetus) and has been used successfully to obtain biopsy specimens from these animals. biopsy specimens were obtained by means of small forceps with visual control given by the modified bronchoscope.1979439853
clinical, epidemiological and therapeutical experience with human tularaemia: the role of hamster hunters.fifty patients suffering from tularaemia were treated in our department. the most frequent occupation of the tularaemia patients was hamster hunter. the most important source of the tularaemic infection (90%) was the hamster (cricetus cricetus). we observed the cutano-glandular form in 90% of the patients and internal tularaemia in 10%. the antibiotics used (streptomycin i. m., oxytetracycline and doxycycline per os) were effective.1979437894
[isolation of rabies virus from common hamster (cricetus cricetus) in czechoslovakia]. 19807246383
effects of bulbectomy on hibernation, food intake and body weight in the european hamster, cricetus cricetus. 19807403287
the fine structure of the exocrine pancreas of the european hamster (cricetus cricetus l.): electron microscopic investigations. 19807405424
[distribution of rabies antigen in the central nervous system of rats and mice experimentally infected with rabies strains isolated from hamsters (cricetus cricetus)].the comparative experiments were carried out to study the distribution of the rabies antigen in the central nervous system (cns) of sewer-rats and mice experimentally infected with three "hamster" strains (for comparison also with "fox" strain 1151); it was found out that with microscopical observation of preparations stained by the method of direct immunofluorescence the "hamster" strains produced a blended picture of fluorescing particles characteristic of strains with a reduced virulence and ...19816791359
[pathogenesis of experimental rabies infection in foxes and cats infected with viruses isolated from hamsters (cricetus cricetus)].all the infected foxes (9) contracted the disease and died from rabies the 20th-21st day from infection with the virus isolated from hamster. out of the total number of 9 cats experimentally infected by intramuscular infection, seven showed symptoms of clinical disease on the 18th-34th day from infection. the infected dogs, wolves and rabbits did not show clinical disease. in the post mortem examination of eight foxes the rabies virus or rabies antigen was detected in all parts of the cns and in ...19816791357
changes in lipid composition of the brain cellular membranes of an hibernating mammal during its circannual rhythm.the lipid composition of whole brain hemispheres and subcellular fractions of european hamsters (cricetus cricetus) was investigated at four different periods of the year. 1. no difference was observed in winter between hibernating animals and active animals awake for 24 hr. 2. a slight increase of cholesterol/phospholipid molar ratio was observed in winter. 3. a slight increase of the ratio ethanolamine phosphoglycerides/choline phosphoglycerides was observed in summer and autumn. 4. some chang ...19827067403
fluorescence polarization study of lipids and membranes prepared from brain hemispheres of a hibernating mammal.the physical behavior of total lipids, microsomes and microsomal lipids prepared from brain hemispheres of european hamsters (cricetus cricetus) was approached by the measure of the fluorescence polarization of the probe 1,6-diphenyl 1,3,5-hexatriene. we compare in this study the results obtained for two critical periods for a hibernator: winter (torpid state) and summer (active state). an increase in fluidity was noticed in the winter lipid and membrane preparations. the difference was however ...19846704130
[rabies in the common hamster (cricetus cricetus) in slovakia].the trials were conducted within the full-scale research on the ecology of lyssa virus. in a period of the mass outbreak of common hamster population in the east slovakian region, 283 hamsters were examined for rabies. using the direct immunofluorescence method (difm), the rabies antigen was detected in the brain of five hamsters. three virus strains (denoted as 3 o, 7 e, 9 e) were isolated by means of the inoculation test on sucking mice. on the basis of the detection of the nucleo-protein anti ...19846441329
skin tumor formation in the european hamster (cricetus cricetus l.) after topical initiation with 7,12-dimethylbenz[a]anthracene (dmba) and promotion with 12-o-tetradecanoylphorbol-13-acetate (tpa).initiation with the carcinogen 7,12-dimethylbenz[a]anthracene followed by promotion with the hyperplasiogenic phorbol ester 12-o-tetradecanoylphorbol-13-acetate carried out on the dorsal skin of european hamsters (cricetus cricetus l.) led to the formation of a broad spectrum of skin tumors in terms of a two-stage principle. tumor formation involved the epidermis and its appendages, the connective tissue, and the vascular and pigmentary system. with regard to the sensitivity to initiation with d ...19846423310
circannual variations of gaba content in cytosolic and crude synaptosomal fractions in some brain areas of the european hamster.in the european hamster, cricetus cricetus, a common hibernator, over a year, the gamma-aminobutyric acid (gaba) content has been followed, in the cytosolic and crude synaptosomal fractions of the olfactory bulbs, hypothalamus and cerebellum. in these 3 areas, the gaba content shows circannual variations of endogenous origin: in this period, in both fractions two peaks can be observed, at the beginning of spring and in autumn. these circannual variations do not follow the circannual variation of ...19854041861
seasonal variation in vasopressin innervation in the brain of the european hamster (cricetus cricetus).using immunocytochemistry, vasopressin innervation was determined in the brain of the european hamster (cricetus cricetus) during different seasons. it was found that the spring period coincides with a dense vasopressin innervation in many brain regions in the male hamster, and lower vasopressin fibre density in some brain regions in the female hamster. in autumn just before hibernation an almost complete disappearance of vasopressin innervation is noted in those brain regions that are sexually ...19863708343
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