| effect of different photoperiods on testicular weight changes in the vole, microtus agrestis. | the testicular weight response of 2-week-old male voles exposed to 10, 12, 14, 15 or 16 h light (l) per day for 4 weeks and of 5-week-old males exposed from birth to 12, 13, 13.5, 14, 14.25, 14.5, 14.75, or 15 h light per day was proportional to the photoperiod: 13l or less produced little growth but 13.5l or more produced progressively heavier testes. only 14.5l and 15l gave full spermatogenesis. 'night-break' schedules produced a marked testicular response with 7l :8d :1l :8d and 7l :6d :1l :1 ... | 1981 | 7014859 |
| topographical relationships of synaptic ribbons in the pineal system of the vole (microtus agrestis). | in the pineal system of the vole (microtus agrestis) both the superficial and the deep pineal exhibit a high percentage of synaptic ribbons lying in intimate contact with the cell membrane of the pinealocytes. at the sites of contact, densities resembling the presynaptic dense projections of synapses are arranged between the ribbons and the cell membrane. opposite the sites of contact various elements were found. the quantitative estimation revealed that in the superficial pineal about 40% and i ... | 1981 | 7023277 |
| effects of age on photo-induced testicular regression, recrudescence, and refractoriness in the short-tailed field vole microtus agrestis. | | 1980 | 6998517 |
| effect of bromocriptine treatment on the ovulatory response to oestradiol benzoate in the reflex ovulator, microtus agrestis. | in some animals which ovulate spontaneously, oestrogen may stimulate prolactin secretion and high levels of prolactin may inhibit steroid-induced surges of lh. the possibility was investigated that such conditions were operating in the reflex ovulator microtus agrestis to prevent spontaneous ovulation. however, bromocriptine treatment to suppress prolactin secretion did not enhance the poor ovulatory response to administration of oestradiol benzoate. | 1980 | 6988538 |
| spontaneous intestinal constipation of the japanese field vole (microtus montebelli) in a laboratory colony. | | 1980 | 7022230 |
| acceleration of ovarian follicle maturation of female caused by male in microtus agrestis and clethrionomys glareolus. | | 1980 | 7004917 |
| feulgen-dna changes in the germ cells of the male vole (microtus agrestis) during their development. | consistent with changes in ploidy during germ cell maturation, the quantity of feulgen dna in round spermatids of voles is approximately a quarter of that in primary spermatocytes. the amount increases slightly in elongated spermatids, and then declines in spermatozoa from the testis, epididymis and vas deferens, below the level of round spermatids. simultaneously nuclear area decreases so that in spermatozoa it is about one tenth that of primary spermatocytes. the rise in feulgen dna in elongat ... | 1980 | 6760273 |
| evidence for a coitally induced 'mnemonic' involved in luteal function in the vole (microtus agrestis). | the development of luteal function in the vole is dependent on a neuroendocrine reflex which is initially activated by mating. bromocriptine was used to destroy the cl initially induced by mating and fresh cl were induced by hormone treatment. the fate of such newly formed cl suggested that the luteotrophic effect of mating continued for about 10 days after mating, despite the destruction of the original mating-induced cl. the luteotrophic effect of mating therefore seems to be 'remembered'. a s ... | 1979 | 390136 |
| pregnancy blockage and the memory of the stud male in the vole (microtus agrestis). | when female voles were allowed contact with the stud male for only 1 h at the time of mating, 55% exhibited pregnancy failure when exposed to a strange male 48 h later. when females were made psuedopregnant by hormone treatment and vaginal stimulation (i.e. no stud male involved), 87% exhibited luteal failure when exposed to a strange male. it is suggested that the characteristics of the stud male are rapidly imprinted upon the female at the time of mating and that this imprinting is important i ... | 1979 | 390135 |
| microtus oeconomus (rodentia), a useful mammal for studying the induction of sex-chromosome nondisjunction and diploid gametes in male germ cells. | preliminary data indicate that chemicals can also increase the frequency of sex-chromosome nondisjunction. positive results--which certainly need further confirmation--have been obtained for mms, p-fluorophenylalanine, vincristine, procarbazine, carbendazim, and bleomycin. nocodazole, benomyl, colcemic, 6-mercaptopurine, and halothane were all negative at the concentrations tested. for the induction of diploid spermatids positive results were only obtained for mms and parafluorophenylalanine. in ... | 1979 | 387396 |
| repair and survival after uv in quiescent and proliferating microtus agrestis cells: different rates of incision and different dependence on dna precursor supply. | cultured cells of microtus agrestis, the common field vole, perform unscheduled dna synthesis after uv irradiation. they respond to incubation with a dna synthesis inhibitor (1-beta-d-arabinofuranosylcytosine) following uv in ways typical of cells capable of excision repair, with reduced survival and an accumulation of breaks in pre-existing dna. microtus cells irradiated with uv in a quiescent pre-s-phase state are more sensitive to uv than are proliferating cells, in terms of survival. adding ... | 1979 | 379024 |
| testis development in the vole, microtus agrestis, subjected to long or short photoperiods from birth. | voles exposed to long photoperiods (16l:8d) from birth became sexually mature at 40-45 days and remained so up to the end of the experiment at 6 months of age. in short photoperiods development was inhibited up to 60 days but the majority of males became sexually mature between 4 and 6 months of age. | 1979 | 374729 |
| the feedback of exogenous steroids on lh release and ovulation in the intact female vole (microtus agrestis). | female voles were subjected to various regimens of subcutaneous injections of oestradiol-17beta, oestradiol benzoate and/or progesterone. ovulation occurred in only a few of the mature females and in none of the immature animals. there was no indication of any increased lh levels in blood samples taken every 2 h for 50 h after 150 microgram oestradiol-17beta. | 1978 | 364048 |
| studies on the control of the corpus luteum in the vole, microtus agrestis. | the lifespan of corpora lutea resulting from hormonally induced ovulations was prolonged by exogenous prolactin, concurrent lactation, or pregnancy. treatment of mated females with bromocriptine resulted in failure of luteal function only when the drug was given before day 6 of pregnancy. pregnancy was dependent on the presence of the ovaries in its later stages. the results suggest that prolactin is luteotrophic in early pregnancy but that a placental luteotrophin may become effective by day 6 ... | 1978 | 344871 |
| interindividual influence on diurnal rhythms of activity in cycling and noncycling populations of the field vole, microtus agrestis l. | the effects of interaction among individuals with respect to wheelrunning activity has been investigated in two geographically separated populations of the field vole microtus agrestis l. in one of them, a northern cyclically varying population, a strictly nocturnal activity pattern is changed into a more or less short term 24 h pattern under conditions of increased contact among individuals. in the other population, south-swedish, without population cycles, no such effects were observed. this i ... | 1978 | 28309735 |
| chromosomes and dna of microtus. ii. confirmation of deletion of constitutive heterochromatin in m. agrestis cells in vitro. | the distribution of constitutive heterochromatin has been examined by c-banding in two somatic cell lines, grown in vitro, from a female microtus agrestis. one line retains one intact x chromosome together with the short arm of the other x chromosome, while the other cell line retains only the short arm of one x chromosome. thus, each cell line has lost substantial amounts of heterochromatin from the sex chromosomes, but this material has been deleted from the cells, and not translocated to othe ... | 1977 | 563281 |
| chromosomes and dna of microtus. iii. heterochromatin rearrangements in m. agrestis bone marrow clones. | newborn microtus agrestis were given single acute whole-body gamma-irradiation (350, 500, or 750r). c-banded bone marrow preparations showed cells with radiation-induced rearrangements of constitutive heterochromatin of the sex chromosomes, usually the consequence of single events, encompassing a wide spectrum of deletions and translocations. these cells persisted in bone marrow for more than a year after irradiation; however, many cells showing the same redistribution of heterochromatin constit ... | 1977 | 328242 |
| methods for determining the proliferation kinetics of cells by means of 5-bromodeoxyuridine. | after treatment of cells with 5-bromodeoxyuridine (budr), the percentage of completely budr-labelled interphase nuclei is greater the longer the budr treatment. the labelling effect is visible after staining with the fluorochrome 33258 hoechst and with giemsa. various formulae and a nomogram are presented by means of which the percentage of cells in s period, duration of the s period and the whole cell cycle can be determined by examination of a single preparation or by comparison of several pre ... | 1977 | 326410 |
| [changes in the heterochromatin structure during cell differentiation in uterus epithelium of the field vole]. | | 1977 | 347764 |
| the effects of pinealectomy and superior cervical ganglionectomy on the testis of the vole, microtus agrestic. | the effects of pinealectomy and superior cervical ganglionectomy on the testis of the vole (microtus agrestis) were studied. testicular weight at 4 and 8 weeks was significantly (p less than .001) greater in pinealectomized and ganglionectomized than in controls animals. similar results were found in the weights of the seminal vesicles. seminiferous tubule diameters were also increased, and spermatogenesis was stimulated. spermatogenic development in controls had preceeded only to the meiotic ph ... | 1976 | 792442 |
| short-term and circadian rhythms in the behaviour of the vole, microtus agrestis (l.). | the activity behaviour of the vole, microtus agrestis, has been recorded in order to investigate the relationship between short-term rhythm and circadian rhythm. a simple device was developed, allowing separate monitoring of the time spent in or outside the nest, wheel-running, eating and drinking. under natural light conditions during summer, a distinct differentiation between a short term rhythm of eating and drinking during the day-time and a circadian rhythm of wheel-running during the night ... | 1976 | 28308925 |
| labelling of dna and differential sister chromatid staining after brdu treatment in vivo. | a method of labelling dna in vivo with 5-bromodeoxyuridine (brdu) is described. after 6 h permanent subcutaneous infusion of brdu in rodents (adult microtus agrestis, pregnant nmri-mice), cell nuclei which have undergone dna synthesis during the brdu treatment can be differentiated from the nuclei of other cycle stages by means of their altered staining behaviour after giemsa. 24 h after the brdu treatment, mitoses from both bone marrow of the adult animals and tissues from the fetuses showed a ... | 1976 | 60205 |
| duration of spermatogenesis in the vole (microtus agrestis) and bank vole (clethrionomys glareolus). | | 1976 | 775076 |
| correlation of plasma lh and prolactin levels with the fate of the corpus luteum in the vole, microtus agrestis. | | 1976 | 775075 |
| transformation of the heterochromatin structure during epithelial cell differentiation in microtus agrestis. | the interphase structure of the constitutive heterochromatin of the field vole, microtus agrestis, was studied in the epithelium of the intestinal and respiratorial tracts, and was compared with the nuclear size and the proliferation rate of these tissues. for determining the nuclear structure and the mitotic and dna labeling rate, feulgen and he-stained paraffin sections were used; measurements of the dna content and of the nuclear and chromocenter areas were carried out on feulgen-stained smea ... | 1976 | 801584 |
| effect of chemical sympathectomy and pinealectomy upon gonads of voles (microtus agrestis) exposed to short photoperiod. | day length or photoperiod is an important determinant of seasonal breeding or sexual maturation in the vole (microtus agrestis). exposure of voles to short (6 h) photoperiods slows gonadal development or causes active gonads to regress. abolishing pineal activity either by chemical sympathectomy, using 6-hydroxydopamine (6-ohda), or by surgical pinealectomy, prevents this inhibiting or regressing effect of shor photo period upon gonads. thus, the pineal gland appears to play a part in the measur ... | 1976 | 800852 |
| on the multiple forms of the liver acid phosphatase from the common field vole, microtus arvalis. | | 1976 | 786539 |
| pregnancy blocking in the vole, microtus agrestis. ii. ovarian, uterine and vaginal changes. | pregnancy blocking in m. agrestis was associated with a rapid degeneration of cl, growth of follicles, a loss of embryos and return of the uterus to its non-pregnant state, and a return to cornified vaginal smears. these results are discussed in relation to the proposal that the immediate cause of pregnancy block is a failure of prolactin secretion resulting in a failure of cl function. | 1976 | 775074 |
| [how the circannual sexual cycle of the malefield vole is determined (author's transl)]. | experiments were carried out on male field voles which have been captured in january. the resting sexual state of the animals at this time was determined by examination of the testis and of the genital tract during unilateral castration or by exploratory laparatomy. they were subsequently bred for 30 days in a climatic room, during which time they were fed on winter or spring grass, which has been preserved by freezing. 10 it was observed that a complete return to full sexual activity (from the ... | 1975 | 772187 |
| late dna replicaion of x chromosomes in female and pseudofemale cells of microtus agrestis. | the late replication pattern of the short arms of the x chromosomes of microtus agrestis was studied in female cells and in cells with 2 x chromosomes of male origin by means of the budr-giemsa technique and of 3h-thymidine labelling. the light absorption of giemsa stained chromosome sections which were unifilarly substituted with budr (labelled), was found to be 59.2% of that of unlabelled chromosomes. in female cells, asynchrony of dna replication of both x chromosomes indicated the presence o ... | 1975 | 53180 |
| heteropyknosis of the chromosomes in liver cells of different ploidy: a nuclear image study. | the chromatin densities of feulgen-stained diploid, tetraploid, octoploid and binucleate cells of smear preparations of the liver of female field voles, microtus agrestis, were examined by means of image analysis. the ratio of the areas of flattened nuclei of 2n, 4n and 8n ploidy was about 1 : 1.62 :2.60 and that of the relative dna content 1 : 2 : 4. in flattened polyploid nuclei, the chromosomes are more densely arranged than in diploid. in diploid nuclei, absolutely and percentually smaller a ... | 1975 | 1108870 |
| further observations on the influence of the social environment on ovulation in the vole, microtus agrestis. | | 1975 | 1102679 |
| proceedings: placental lactogen secretion in the field vole (microtus agrestis) and the bank vole (clethrionomys glareolus). | | 1975 | 1097562 |
| spermatogenesis in mature and regressed testes of the vole (microtus agrestis). | eight stages of spermatogenesis, each with a characteristic frequency and germ cell association could be recognized in the vole. there was no difference between laboratory bred and field animals in the frequency of the stages. counts of the different types of germ cell showed that there was considerable cell loss during spermatogonial mitotic and spermatocytic meiotic divisions. only 60% of germ cells became spermatozoa in sexually mature animals, and 19% in the regressing testes of voles expose ... | 1975 | 1095738 |
| the copulatory behavior of microtus agrestis. | | 1975 | 1113043 |
| the method of intragastric administration of fluids to field voles (microtus arvalis pallas). | | 1975 | 1136605 |
| the repeated dna sequences of microtinae. ii. localization and interdispersion of repeated sequences in microtus agrestis. | | 1975 | 1122944 |
| [linear differentiation of the x-chromosomes of the field vole microtus agrestis]. | morphology of the fibroblasts x-chromosomes obtained from the female field vole microtus agrestis and cultured for 4--5 hr before fixation in 5-bromodeoxyuridine, was studied. a clear differential condensation along the lenght of the whole x-chromosome was observed. a difference between homologues in the degree of uneven condensation was noted both in the short arm (facultative heterochromatin) and in the long arm (constitutive heterochromatin). | 1975 | 1118897 |
| the effect of mating upon lh release in male and female voles of the species microtus agrestis. | | 1975 | 1110468 |
| heterochromatin and sister chromatid exchanges in the chromosomes of microtus agrestis. | | 1975 | 1100572 |
| electrical stimulation of the hypothalamus and lh release in the vole, microtus agrestis. | | 1975 | 1089151 |
| social environment and ovulation in the vole, microtus agrestis. | | 1974 | 4473548 |
| photoperiodic control of testis activity in the vole, microtus agrestis. | | 1974 | 4415059 |
| the development of the ovary from birth to maturity in the bank vole (clethrionomys glareolus) and the vole (microtus agrestis). | | 1974 | 4829082 |
| application of an established diploid microtus agrestis cell line as a model for the understanding of mammalian heterochromatin. | | 1974 | 4131765 |
| polyploidization in vitro: formation of a predominantly triploid cell population in an originally diploid tissue culture of microtus agrestis. | | 1974 | 4600713 |
| heterochromatin and chromosomal aberration in microtus agrestis: role of chromosomal association. | | 1974 | 4842085 |
| field and laboratory studies on the control of luteinizing hormone secretion and gonadal activity in the vole, microtus agrestis. | | 1973 | 4522408 |
| [amino acid composition of blood proteins of field voles (microtus oeconomus pall.), living in different radioecological conditions]. | | 2003 | 4780543 |
| fluorescence banding pattern of the chromosomes of microtus agrestis with a benzimidazol derivative. | | 1973 | 4126706 |
| loss of heteropycnosis of the constitutive heterochromatin in specifically activated cells of the thyroid gland of microtus agrestis. | | 1973 | 4693092 |
| sebaceous glands on the hindquarters of the vole, microtus agrestis. | | 1972 | 4119254 |
| fluorescence of constitutive heterochromatin of microtus agrestis. | | 1972 | 5036994 |
| a study of spermatogenesis in the developing and mature vole (microtus agrestis). | | 1972 | 5017010 |
| pattern of repetitive dna of the chromosomes of microtus agrestis. | | 1972 | 5025666 |
| the c-band and g-band patterns of microtus agrestis chromosomes. | | 1972 | 4561269 |
| radiation-induced deletions and translocations of microtus agrestis sex chromosomes in vivo. | | 1971 | 5097521 |
| repetitive dna of microtus agrestis. | | 1971 | 5563308 |
| binding of actinomycin d to constitutive heterochromatin in microtus agrestis. | | 1971 | 5580888 |
| seasonal changes of pelage in the vole (microtus agrestis). ii. the effect of daylength. | | 1971 | 5550927 |
| seasonal changes of pelage in the vole (microtus agrestis). i. correlation with changes in the endocrine glands. | | 1971 | 5550926 |
| seasonal changes of pelage in the vole (microtus agrestis). 3. the role of the endocrine system. | | 1971 | 4323875 |
| [pairing behaviour of the sex chromosomes during male meiosis of microtus agrestis]. | | 1971 | 5574764 |
| isolation, fractionation and biochemical analysis of the metaphase chromosomes of microtus agrestis. | | 1971 | 5131758 |
| cytological variations in the constitutive heterochromatin of microtus agrestis. | | 1971 | 5131757 |
| constitutive heterochromatin in microtus agrestis: binding of actinomycin-d and transcriptional inactivity. | | 1971 | 5116080 |
| a developmental study of constitutive heterochromatin in microtus agrestis. | | 1971 | 5103061 |
| tritiated uridine induced chromosome aberrations in relation to heterochromatin and nucleolar organisation in microtus agrestis l. | | 1971 | 5096941 |
| fluorochromes and heterochromatin. a study of the chromosomes of microtus agrestis l. | | 1971 | 4142019 |
| ovarian changes during pregnancy and pseudopregnancy in the vole, microtus agrestis. | | 1970 | 5492027 |
| effect of photoperiod on ovarian function in the vole, microtus agrestis. | | 1970 | 5528678 |
| hypothalamic influence on pituitary and serum levels of lh in the vole, microtus agrestis. | | 1970 | 5500823 |
| the electron microscopy of the adenohypophysis of the vole, microtus agrestis. | | 1970 | 5500821 |
| expression of constitutive heterochromatin in cultured fibroblasts from microtus agrestis. | | 1970 | 5459844 |
| ovulation and associated histological changes in the ovary following coitus in the vole (microtus agrestis). | | 1970 | 5421106 |
| constitutive heterochromatin during early embryogenesis of microtus agrestis. | | 1970 | 5413549 |
| differential rna synthesis of eu- and heterochromatin in microtus agrestis. | | 1970 | 5412268 |
| deletions of the x chromosomes in microtus agrestis cells in vitro. | | 1970 | 5519129 |
| quantitative autoradiography of heterochromatin replication in microtus agrestis. | | 1970 | 5480728 |
| genetic inactivity of heterochromatin and heteropycnosis in microtus agrestis. | | 1970 | 5436406 |
| the morphology and life-history of trypanosoma (herpetosoma) microti of the field-vole, microtus agrestis. | | 1969 | 5372140 |
| oestrus and ovarian histology in the lactating vole (microtus agrestis). | | 1969 | 5791681 |
| [distribution of chromosomes to the daughter cell nuclei of multipolar mitoses in euploid tissue cultures of microtus agrestis]. | | 1969 | 5800669 |
| [distribution of radiation-induced breaks in the sex chromosomes of microtus agrestis]. | | 1969 | 5391961 |
| [deletion and translocation of heterochromatic chromosome segments of microtus agrestis]. | | 1969 | 5391960 |
| [structure and position of heterochromatic chromosomes in interphase nuclei of microtus agrestis]. | | 1969 | 4900457 |
| pregnancy-block in microtus agrestis and induced ovulator. | | 1968 | 5668444 |
| interrupted ongoing behaviour in two species of vole (microtus agrestis and clethrionomys britannicus). ii. extended analysis of motivational variables underlying fleeing and grooming behaviour. | | 1968 | 5639894 |
| interrupted ongoing behaviour in two species of vole (microtus agrestis and clethrionomys britannicus). i. response as a function of preceding activity and the context of an apparently "irrelevant" motor pattern. | | 1968 | 5639892 |
| a biochemical and ecological study of plasma esterase polymorphism in natural populations of the field vole, microtus agrestis l. | | 1968 | 5707672 |
| formation and division of binucleated cells in kidney cell cultures of microtus agrestis. | | 1968 | 5704434 |
| resistance of the short-tailed vole microtus agrestis (l.) to infection with two arboviruses. | | 1967 | 6075434 |
| a serum esterase variation in microtus agrestis (l.). | | 1967 | 6064102 |
| effect of light and temperature upon gonad activity in the vole (microtus agrestis). | | 1967 | 6034722 |
| changes in the hypothalamo-hypophysial neurosecretory system and the gonads of the vole (microtus agrestis). | | 1967 | 6034721 |
| [seasonal and age variations in the skeletal dose of radiation due to incorporated strontium 90 in field voles under natural conditions]. | | 2003 | 5608542 |
| the chromosomes of long term cultivated field-vole cells. | | 1967 | 5585054 |
| [dna reduplication pattern in the giant sex chromosomes of microtus agrestis]. | | 1965 | 5857561 |
| the relation of sex chromosomes to chromocenters in somatic cells of microtus agrestis (l.). | | 1965 | 5826652 |
| seasonal changes in the adenohypophysis of the vole (microtus agrestis). | | 1964 | 14184079 |