| [the human dental pulp as viewed through a scanning electron microscope (author's transl)]. | the human dental pulp was examined using a scanning electron microscope. the odontoblasts are pear-shaped and have a fine-grain surface structure. tomes' process divides into fine branches before entering the predentin. very few fibroblasts were found. these had stronger cell processes at the two terminal poles. adhering to their surfaces were fine fibers. collagenous and nerve fibers could not be accurately identified in the rich fibrillary network of the pulp. stronger nerve fasciculi were rea ... | 1979 | 157024 |
| long-term cultivation of plasma cell leukemia cells and autologous lymphoblasts (lcl) in vitro: a comparative study. | two long-term cell lines were established in vitro from the peripheral blood of a patient with plasma cell leukemia: one line with plasma cell proliferation, the other with lymphoblastoid cell proliferation (lcl). the 9-month-old plasma cell line showed the typical morphology of plasmoblasts. the cells neither had b- nor t-lymphocyte characterisitics, were ebv negative, and showed aneuploidy with various marker chromosomes, including the 14 q+ marker. the cytogenetic findings indicate a monoclon ... | 1978 | 207377 |
| morphological changes of basophils in immunological reactions--effect of sodium cromoglycate. | the morphological changes in blood basophils, from patients with bronchial asthma, were studied in vitro during immunological reactions, with particular reference to interaction with anti-ige. anti-human ige results in an absolute reduction in basophil numbers in buffy coat preparations as well as basophil cytoplasmic degranulation. an increase in the number of pear-shaped (a-form) basophils is also observed. sodium cromoglycate impairs all these anti-ige induced basophil changes, providing furt ... | 1975 | 806398 |
| the basilar pontine gray in the adult monkey (macaca mulatta): a golgi study. | in golgi preparations of the adult monkey (macaca mulatta) two types of neurons are distinguished in the pontine gray: (1) larger neurons which impregnate most frequently and (2) smaller neurons which impregnate rarely. the former are judged to be projection neurons with myelinated axons because only the initial segments of their axons impregnate, while the latter are judged to be intrinsic neurons since they appear to participate only in the local circuitry of the pontine gray. the projection n ... | 1976 | 819468 |
| [electron microscopic study of perisomatic process development in cerebellar cortex pyriform neurons during prenatal human ontogenesis]. | perisomatic processes are shown to be temporary morphological formations that appear within 16-28 weeks of embryogenesis, their development being characterized by a certain succession. perisomatic processes form multiple synaptic complexes with axon endings of unknown origin adherent to perikaryons of pear-shaped neurons. these axon endings are supposed to belong to afferent climbing fibers of cerebellum stimulating differentiation of pear-shaped neurons, localization of these fibers causing a c ... | 1978 | 684839 |
| the carbohydrate linkage site of cow colostrum trypsin inhibitor. | cow colostrum trypsin inhibitor (chromatographic form aiv[7])was subjected to basic conditions that favour beta-elimination of carbohydrates from o-glycosidic linkages. the unchanged carbohydrate composition and the unchanged values for serine and threonine indicate the presence of an alkali-stable n-glycosidic bond to asparagine. from a tryptic digest of s-aminoethylated inhibitor the glyco-decapeptide (residues 24 through 33) was isolated. the carbohydrate composition was identical with that o ... | 1978 | 649052 |
| topography of the myosin molecule as visualized by an improved negative staining method. | an improved negative staining method has been used to visualize monomeric myosin molecules. each lobe (subfragment 1) of the molecule looked like an elongated pear, and the widths of the thick and thin portions were about 95 and 55 a, respectively. the length of each lobe was about 210 a. it appeared capable of moving azimuthally and altitudinally, utilizing its juncture with the rod portion as the base. the rod portion of the molecule was about 1400 a long and 30 a wide. it also appeared to pos ... | 1978 | 641037 |
| role of antibiotic production by erwinia herbicola eh252 in biological control of erwinia amylovora. | erwinia herbicola eh252 is a nonpathogenic epiphytic bacterium that reduces fire blight incidence when sprayed onto apple blossoms before inoculation with erwinia amylovora, the causal agent of fire blight. eh252 was found to produce on minimal medium an antibiotic that inhibited the growth of e. amylovora. this antibiotic was inactivated by histidine but not by fe(ii), was sensitive to proteolytic enzymes, and showed a narrow host range of activity. to determine the role of this antibiotic in t ... | 1992 | 1314801 |
| [unsaponifiable fractions of the avocado and soy bean in gyneocology]. | the experimental work of robert on the action of the unsaponifiable fractions of the avocado pear and soya bean on inflammatory granulomata of the rat gives rise to the supposition that these have a selective action on inflamed connective tissue by a process of katabolism of collagen through proteolytic enzymes. we have used this anti-inflammatory and collagenolytic action in gynaecology, with favourable results particularly in post-inflammatory and post-infective conditions as well as scarring ... | 1977 | 558245 |
| inhibition of growth and guanylate cyclase activity of an undifferentiated prostate adenocarcinoma by an extract of the balsam pear (momordica charantia abbreviata). | we have recently described the presence of a guanylate cyclase gtp pyrophosphate-lyase (cyclizing), ec 4.6.1.2 inhibitor (gci) in an aqueous extract of the balsam pear (momordica charantia abbreviata). because the guanylate cyclase-cyclic gmp system is though to be involved in cell growth, dna and rna synthesis, and possible malignant transformation, we examined the effect of the aqueous extract containing gci on an undifferentiated adenocarcinoma of the rat prostate and concanavalin-a-stimulate ... | 1978 | 24847 |
| isolation of a guanylate cyclase inhibitor from the balsam pear (momordica charantia abreviata). | | 1977 | 20099 |
| characterization of a strain of methanospirillum hungatti. | the results of morphological, base ratio, nutritional, temperature, and ph studies on a strain of methanospirillum hungatii, isolated from an anaerobic pear waste digester, are described. the isolate, designated as strain gp 1, was compared with some of the characteristics of type-strain m. hungatii jf 1. strain gp 1 is gram-negative, weakly motile, and a strict anaerobe with a guanine plus cytosine (g +c) content of 46.5 mol%. the preferred substrates for methane production are hydrogen, carbon ... | 1976 | 10074 |
| [yeast flora of plant rhizosphere and phyllosphere]. | the species belonging to the genera cryptococcus and hansenula with saturnian spores predominate in the rhizosphere of agricultural plants. the sporiferous strains of debaryomyces, hanseniaspora apiculata, metschnikowia pulcherrima, and asporogenic candida krusei and trichosporon cutaneum prevail in the rhizosphere of wild plants. candida krusei and trichosporon cutaneum prevail in the rhizosphere of wild plants. the cultures of rhodotorula, candida krusei and metschnikowia pulcherrima are typic ... | 1975 | 1226148 |
| development of the voicing contrast: perception of stop consonants. | perceptual development of the voicing contrast was investigated in two-year-old children, six-year-old children, and adults. subjects were required to identify prevocalic stop consonants from synthetic speech stimuli--bees/peas, bear/pear, dime/time, and goat/coat. the stimuli differed with respect to the acoustic cue, voice onset time (vot). identification functions for labial, apical, and velar stops were plotted for each subject. measurements of 50% crossover, lower and upper limits of the ph ... | 1975 | 1186163 |
| [current status of the clinical evaluation of psychotropic drugs]. | this paper deals with the analysis of different research conceptions and designs, according to different areas: i. human pharmacology and toxicology; ii. therapeutic prescriptions; iii. therapeutic effects; iv. thorough clinical testing. there is a strongly felt -eed of universally acknowledged rating scales for the assessment of the effects psychothropic drugs have on mental diseases. the lack of experimental models, together with the wide span of psychodinamic conceptions, overemphasizes the n ... | 1975 | 1163268 |
| comparative microscopical study of the gall bladder mucosa. | the gall bladder from 6 psammophis sibilans, 10 bufo regularis and 10 albino mice were extracted and prepared for microscopic examination. it was found that the mucosa of psammophis sibilans consisted of ovoid and polygonal cells which were occasionally binucleated cells with darkly stained nuclei and occasionally pear-shaped cells with vesicular nuclei and fine processes. these cells were arranged in three layers. apossible explanation for the different types of cells encountered and their arra ... | 1975 | 1136701 |
| a comparison of the properties in vitro of biphenyl 2- and 4-hydroxylase in the mesocarp from avocado pear (persea americana) and syrian-hamster hepatic tissue. | | 1975 | 1132558 |
| [the state of the neural elements of the intestine in the aging organism]. | the small intestine of the ageing human (15 cases from 70 to 88 years of age) and dogs (20 cases from 15 to 20 years of age) was treated by histological and neuro-histological methods. vacuolic dystrophy of neurons and hyperplasia, thickening of their processes were found. different formations up to 15 in number and from 20 to 60 mkm in size were revealed in the dog small intestine wall along the course of the nerve fibre. they were of pear-like, oval or round shape. inside these formations some ... | 1975 | 1131029 |
| conjugational transfer of genes determining plant virulence in erwinia amylovora. | a stable virulent donor strain (ea 178r1-99) of erwinia amylovora can transfer, by conjugation during a 3-h mating period, the gene or genes which determine(s) plant virulence to avirulent recipient strains (ea178-m64s1 and ea178-m173s1) of escherichia amylovora. the virulence of over 200 recombinant clones was tested; they all were as virulent on immature bartlett pear fruits (and, in the smaller series of strains tested, also, on pyracantha twigs) as was the parent donor strain. although the a ... | 1975 | 1126916 |
| acute poisoning in a puppy caused by the balsam pear (momordica charantia). | | 1976 | 1047586 |
| light microscopy and scanning electron microscopy of bathmostomum sangeri cobbold, 1879, of elephants. | bathmostomum sangeri is an intestinal parasite of the elephant. males measured 12.15-14.25 mm in length; females measured 14.98-17.68 mm in length. buccal capsule is well-developed and funnel-shaped. there is a raised and transverse fissure ridge around the oral margin. the internal wall of the buccal capsule is raised into a series of circular ridges or lamellae. teeth or cutting plates could not be seen. spicules are stout, wing-like structures. the telamon is pear-shaped, but a gibernaculum i ... | 1976 | 1035986 |
| the morpho-histology of the pituitary glands in two freshwater major carps of india, labeo rohita (ham.) and cirrhinus mrigala (ham.). | 1. the pituitary gland in labeo rohita and cirrhinus mrigala is a small, pear-shaped, whitish, soft body situated in a cavity -- the sella turcica. the gland is of the lepto-dorso basic type. 2. it consists of the neurohypophysis and adenohypophysis. the latter comprises three lobes viz., the rostral pars distalis, the proximal pars distalis and the pars intermedia. 3. the neurohypophysis branches into the pars distalis, extends into the pars intermedia and ramifies extensively. it is composed o ... | 1976 | 984440 |
| [ultrastructure of the epithelium of the major pancreatic duct in sheep]. | light-and electron-microscopic and some histochemical investigations on the epithelium or the ductus pancreaticus major were carried out in sheep. at least six different cell types are recognizable: (1) nondifferentiated duct cells; (2) cells containing apical secretory granules; (3) goblet cells; the mucosubstances of type 2 and 3 are pas- and alcian-blue-positive, also reacting wih methenamine silver; (4) ciliated cells, containing a single cilium with the microtubular pattern 9+2; (5) tuft ce ... | 1976 | 970105 |
| fusiform erythrocytes resembling sickle cells in angora goats: light and electron microscopic observations. | fresh blood from nine mature non-pregnant angora goats was found to contain a varying proportion of spindle-shaped, fusiform, triangular, pear-shaped, and other bizarre forms of erythrocytes in addition to normal discoid biconcave erythrocytes. the number of spindled and fusiform erythrocytes varied from 2 to 66 per cent, with two goats having such cells in excess of 50 per cent. other aberrant forms of erythrocytes ranged from 3 to 54 per cent. although the aberrant erythrocytes seemed to be pr ... | 1977 | 860092 |
| gross and microscopic anatomy of the biliary tract of the ferret. | the gross and microscopic anatomy of the biliary tract of the ferret was studied. the liver consisted of six separate lobes. the coronary ligament was not present. histologically, it was very similar to that of man. the gall-bladder was present and was a pear-shaped sac. its muscle coat was very thick and well developed. hepatic ducts were multiple. minor hepatic ducts formed three major ducts, the left, central and the right. a single common hepatic duct was not present. the cystic duct general ... | 1977 | 848264 |
| food sensitivity reported by patients with asthma and hay fever. a relationship between food sensitivity and birch pollen-allergy and between food sensitivity and acetylsalicylic acid intolerance. | among adult patients with bronchial asthma and/or allergic rhinitis undergoing allergological investigation with skin test, nasal provocation test and rast, 1129 answered a questionaire regarding food sensitivity (fs). 276 (24%) of the patients reported some kind of allergic symptoms on eating or handling various foods, of which hazel nut, apple and shell fish were the most often named. females reported fs more often than males. a correlation was found between birch pollen allergy and fs with nu ... | 1978 | 717703 |
| development of the voicing contrast: a comparison of voice onset time in stop preception and production. | the acoustic cue voice onset time (vot) was used to study development of the voicing contrast in 10 two-year-old children, 10 six-year-old children, and 20 adults. thirty utterances of the words bees, peas, bear, pear, dime, time, goat, and coat were elicited from each subject, vot measured, and individual production distributions for labial, apical, and velar stops plotted. significant age-related differences were shown for mean vot, mean lead time for voiced stops, range of the same words that ... | 1976 | 1271805 |
| two-dimensional crystals of membrane-bound gastric h,k-atpase. | two-dimensional crystallization of membrane-bound h,k-atpase (ec 3.6.1.36) in vesicle preparations from parietal cells of hog gastric mucosa was induced by an imidazole buffer containing mg2+ and vo3- ions. a continuous reorganization of the protein molecules started within a few hours by the formation of linear arrays. at later stages confluent two-dimensional crystals were formed. electron microscopy and image processing showed that these were of a single tetragonal type. the asymmetric unit c ... | 1992 | 1312039 |
| localization of transposon insertions in pathogenicity mutants of erwinia amylovora and their biochemical characterization. | transposon tn5, on a mobilizable cole1 plasmid, on a ti plasmid derepressed for bacterial transfer, and on the bacteriophage fd genome, was used to construct pathogenicity mutants of the fire blight pathogen erwinia amylovora. eleven nonpathogenic mutants were isolated from 1600 independent mutants screened. these mutants were divided into three types: auxotrophs, exopolysaccharide (eps)-deficient mutants and a mutant of the dsp phenotype. according to their insertion sites the tn5 mutants were ... | 1992 | 1322951 |
| nucleotide sequence and taxonomic value of the major outer membrane protein gene of chlamydia pneumoniae iol-207. | chlamydia pneumoniae iol-207 genomic dna was hybridized with a 1.5 kb labelled dna probe containing the 3' region of the coding sequence for the major outer membrane protein (momp) of c. trachomatis serovar l1. an 8.5 kb bg/ii fragment containing the complete momp gene was cloned into lambda embl3. two hybridizing ecori fragments were sub-cloned into the lambda zap ii cloning vector and the resulting plasmids were used as templates for sequencing both strands of the c. pneumoniae momp gene. comp ... | 1991 | 2033374 |
| sexual conjugation in yeast. cell surface changes in response to the action of mating hormones. | in the yeast saccharomyces cerevisiae, sexual conjugation between haploid cells of opposite mating type results in the formation of a diploid zygote. when treated with fluorescently labeled concanavalin a, a zygote stains nonuniformly, with the greatest fluorescence occurring at the conjugation bridge between the two haploid parents. in the mating mixture, unconjugated haploid cells often elongate to pear-shaped forms ("shmoos") which likewise exhibit asymmetric staining with the most intense fl ... | 1979 | 379012 |
| 14c-dopamine microinjected into the brain-stem of the rat: dispersion kinetics, site content and functional dose. | a morphological analysis was undertaken of both the dispersion characteristics and tissue content of dopamine (da) microinjected acutely into the brain-stem of the anesthetized rat. 14c-da, with a specific activity of 56-62 mci/mmol, was infused unilaterally into the pars compacta of the substantia nigra in one of four test volumes: 0.5, 1.0, 4.0 or 8.0 microliters. the concentration of the 14c-da solution was 1.0 microci/microliter, equivalent to 3.01 micrograms/microliters, which was delivered ... | 1978 | 318183 |
| [morphology and immunotyping of ac-43 strain of chlamydia pneumoniae isolated from a japanese child]. | a strain of chlamydia pneumoniae (c. pneumoniae) which had been isolated from a japanese child (ac-43) was examined morphologically and serologically using micro-immunofluorescent (micro-if) test. inclusions of ac-43 were stained by an indirect immunofluorescent method using c. pneumoniae specific monoclonal antibody. they were dense round inclusions which had been reported as a characteristic figure for c. pneumoniae. an elementary body (eb) of ac-43 was pear-shaped by electron micrograph, whic ... | 1992 | 1402097 |
| gamma-aminobutyric acid immunoreactivity in the enterochromaffin cells of the rat stomach. | the present immunocytochemical study revealed gamma-aminobutyric acid (gaba) immunoreactivity in the oxyntic and pyloric mucosa of the rat stomach at light- and electron-microscopic levels. gaba-immunoreactive endocrine cells were numerously seen in the lower half portion of the pyloric mucosa but rarely in the oxyntic mucosa. these cells were round or oval in shape and sometimes had a short cytoplasmic process. serotonin-immunoreactive enterochromaffin (ec) cells were also observed in the oxynt ... | 1992 | 1441883 |
| cloning of a large gene cluster involved in erwinia amylovora cfbp1430 virulence. | phage mudiipr13 insertional mutagenesis of erwinia amylovora cfbp1430 allowed us to isolate 6900 independent cmr mutants. the frequencies of different auxotrophs in this population indicated that mudiipr13 had inserted randomly in e. amylovora. screening of 3500 cmr mutants on (i) apple calli and (ii) pear and apple seedlings led to the isolation of 19 non-pathogenic prototrophic single mutants, four of which expressed a lacz+ hybrid protein. expression of the fusion proteins was temperature sen ... | 1990 | 2117695 |
| refractory barriers in the sand fly phlebotomus papatasi (diptera: psychodidae) to infection with leishmania panamensis. | the life cycle of leishmania panamensis in phlebotomus papatasi was studied to characterize barriers limiting parasite colonization, differentiation, migration, and attachment in an unnatural sand fly host. the insects were fed a suspension of l. panamensis-infected macrophages and human erythrocytes, and were examined up to 16 days post-infection by light and electron microscopy. histologic examination of 401 flies showed the peritrophic membrane to be the first important barrier to parasite es ... | 1992 | 1539756 |
| synaptic connections of central carotid sinus afferents in the nucleus of the tractus solitarius of the rat. i. an electron microscopic study. | a transganglionic transport technique was used to study the synaptic connections of the central carotid sinus afferents in the nucleus of the tractus solitarius of the rat by electron microscopy. the caudal part of the nucleus was profusely innervated. labelled fibres extended to the contralateral nucleus, and to the ipsilateral dorsal motor nucleus of the vagus nerve, nucleus ambiguus, spinal nucleus of the trigeminal nerve and the area postrema. the labelled terminals were densely packed with ... | 1992 | 1560250 |
| 3-oxoacyl-[acp] reductase from oilseed rape (brassica napus). | 3-oxoacyl-[acp] reductase (e.c. 1.1.1.100, alternatively known as beta-ketoacyl-[acp] reductase), a component of fatty acid synthetase has been purified from seeds of rape by ammonium sulphate fractionation, procion red h-e3b chromatography, fplc gel filtration and high performance hydroxyapatite chromatography. the purified enzyme appears on sds-page as a number of 20-30 kda components and has a strong tendency to exist in a dimeric form, particularly when dithiothreitol is not present to reduc ... | 1992 | 1562581 |
| [inhibitory effects of balsam pear on the mutagenic activity of cyclophosphamide in vivo]. | inhibitory effects of balsam pear on the mutagenic activity of cyclophosphamide were studied in the cells of bone marrow of mouse in vivo. it was found that balsam pear juice itself showed no effect on the incidence of sister chromatid exchanges (sce) and of micronuclei (mn) on the cells of bone marrow. but balsam pear juice reduced the incidence of sce (from 29.1 times/cell to 13.27-28.38 times/cell) and mn (from 60.0% to 27.0%-50.0%) induced by cyclophosphamide respectively. the inhibitory eff ... | 1992 | 1606864 |
| harpin, elicitor of the hypersensitive response produced by the plant pathogen erwinia amylovora. | a proteinaceous elicitor of the plant defense reaction known as the hypersensitive response was isolated from erwinia amylovora, the bacterium that causes fire blight of pear, apple, and other rosaceous plants. the elicitor, named harpin, is an acidic, heat-stable, cell-envelope-associated protein with an apparent molecular weight of 44 kilodaltons. harpin caused tobacco leaf lamina to collapse and caused an increase in the ph of bathing solutions of suspension-cultured tobacco cells. the gene e ... | 1992 | 1621099 |
| effects of ethanol and various alcoholic beverages on the formation of o6-methyldeoxyguanosine from concurrently administered n-nitrosomethylbenzylamine in rats: a dose-response study. | consumption of alcoholic beverages has been identified as a major cause of oesophageal cancer in industrialized countries, with an exceptionally high risk associated with apple-based liquors (calvados). in the present study, we have determined the dose--activity relationship of the effects of coincident ethanol on the formation of o6-methyldeoxyguanosine (o6-medg) by the oesophageal carcinogen n-nitrosomethylbenzylamine (nmbza). male fischer 344 rats received a single intragastric dose of nmbza ... | 1992 | 1638683 |
| first heterotransplantation of a human carcinoid tumor into nude mice. | the first successful heterotransplantation of a human carcinoid tumor into nude mice is reported. csh, a voluminous hepatic metastasis of a primary bronchial carcinoid tumor (csb) was resected and transplanted into three irradiated nude (swiss-nu/nu) mice both by subcutaneous (sc) and intramuscular (im) routes; the success rate was five of six. heterotransplanted tumors took 4 to 5 months to appear in the mice and 1 month to attain a width of 0.5 cm. both human and mouse tumors (named csh-sc and ... | 1991 | 1649689 |
| protein phosphatase 2a in saccharomyces cerevisiae: effects on cell growth and bud morphogenesis. | we have cloned three genes for protein phosphatases in the yeast saccharomyces cerevisiae. two of the genes, pph21 and pph22, encode highly similar proteins that are homologs of the mammalian protein phosphatase 2a (pp2a), while the third gene, pph3, encodes a new pp2a-related protein. disruptions of either pph21 or pph22 had no effects, but spores disrupted for both genes produced very small colonies with few surviving cells. we conclude that pp2a performs an important function in yeast cells. ... | 1991 | 1656215 |
| localization of neuropeptide-immunoreactive neurons in the human retina. | light microscopic immunocytochemistry was utilized to localize populations of neurons in the human retina immunoreactive for the following neuroactive peptides: substance p (sp), vasoactive intestinal polypeptide (vip), somatostatin (som) and lant-6-(h-lys-asn-pro-tyr-ile-leu-oh), a hexapeptide which is identical to the c-terminal half of neurotensin except for the amino acid substitutions lys/arg and asn/arg. the majority of sp immunoreactive cells were amacrine cells whose pear-shaped or oval ... | 1990 | 1699634 |
| suspected avocado (persea americana) poisoning in goats. | a herd of 15 cameroon goats was suspected of having been poisoned by eating leaves of the fuerte variety of avocado pear (persea americana). two of the affected goats were examined clinically, while necropsies were carried out on 3 of the 4 that had died. the most significant clinical findings were tachycardia, hyperpnoea and evidence of lung oedema. at necropsy severe lung oedema, hydrothorax and hydropericardium were present. severe myocardial degeneration, necrosis and fibrosis were the major ... | 1991 | 1770497 |
| ultrastructure of chlamydia pneumoniae in cell culture. | the electron microscopic appearance of chlamydia pneumoniae elementary bodies with pear-shaped, loose outer membrane has been suggested as one criterion of its classification as a new chlamydial species. the study of the original strain tw 183 in lcl 929 and hl cells and a low-passage isolate of kajaani-6 isolate in hl cells revealed spherical compact elementary bodies common to other chlamydia. | 1991 | 1778435 |
| three-dimensional structure of myosin subfragment-1 from electron microscopy of sectioned crystals. | image analysis of electron micrographs of thin-sectioned myosin subfragment-1 (s1) crystals has been used to determine the structure of the myosin head at approximately 25-a resolution. previous work established that the unit cell of type i crystals of myosin s1 contains eight molecules arranged with orthorhombic space group symmetry p212121 and provided preliminary information on the size and shape of the myosin head (winkelmann, d. a., h. mekeel, and i. rayment. 1985. j. mol. biol. 181:487-501 ... | 1991 | 1869586 |
| scanning electron microscopic study of odontoblasts and circumpulpal dentin in a human tooth. | two combined scanning electron microscopic methods including modified fixative procedures were used for studying the morphologic aspects of the odontoblasts and the corresponding dentinal wall at different endodontic levels. the odontoblasts were tightly packed in the pulp horn, where they assumed pear-shaped profiles and, from crown to apex, successively looked spindle shaped, club shaped, and globular. their number decreased in the pulp radicular portion, where the interglobular spaces were en ... | 1991 | 1923448 |
| [contractile function, extracardiac regulation and morphological changes in the hearts of rats in the dynamics of a long-term continuously acting stressor situation]. | 24 hrs of the overpopulation stress effect induced a set of shifts typical for an acute stress syndrome in rats. within 5 days the organism mobilizes the cholinergic stress-limiting system functioning for 15 days, limiting and normalizing the contractile function (cf) of the heart, and eliminating the contracture damages of the myocardium on the 30th day. starting from the 30th day of the stress effect, adrenergic features of the extracardiac regulation (er) re pear, the cf parameters increase, ... | 1990 | 1966085 |
| chronic disease in goats orally infected with two isolates of the caprine arthritis-encephalitis lentivirus. | newborn saanen goats were orally infected with two distinct biologically cloned isolates of the caprine arthritis-encephalitis lentivirus (caev), designated caev(63) (crawford tb, adams ds, cheevers wp, cork lc: science 207:997, 1980) and caev (co) (cork lc, hadlow wj, crawford tb, gorham jr, piper rc: j infect dis 129:134, 1974; narayan o, clements je, strandberg jd, cork lc, griffin de: j gen virol 50:69, 1980). all infected goats seroconverted for antibodies to caev, and there were no serolog ... | 1988 | 2835548 |
| immunohistochemical localization of glutamine synthetase in mesencephalon and telencephalon of the lizard gallotia galloti during ontogeny. | the immunohistochemical localization of glutamine synthetase, an astrocyte marker in mammals, was determined in the telencephalon and mesencephalon of the lizard gallotia galloti during development by using an antiserum raised against chicken brain glutamine synthetase. ependymal glial cells and their radial processes were glutamine synthetase immunoreactive, and they were present also in the adult. immunoreactivity was also detected in two populations of scattered cell bodies, each preferential ... | 1990 | 1970551 |
| a novel endocrine cell type in the guinea-pig gastric mucosa: cellular source of pro-enkephalin-derived peptides. a histochemical, immunohistochemical, and electron microscopical characterization. | a novel endocrine cell type has been identified in the guinea-pig gastric mucosa which preferentially occurs in the oxyntic area. cells of this type exhibit immunoreactivities for bovine adrenal medulla dodecapeptide (bam-12p) and in many cases for met-enkephalin and are thus presumed to contain a pro-enkephalin-like precursor protein. systematic immunohistochemical investigations show that these cells do not contain immunoreactivities for various enteric hormones, neuropeptides and biogenic ami ... | 1990 | 1972145 |
| prickly pear (opuntia sp.) pectin reverses low density lipoprotein receptor suppression induced by a hypercholesterolemic diet in guinea pigs. | the effects of prickly pear pectin on plasma ldl metabolism were investigated by feeding guinea pigs either a diet containing 15 g/100 g lard and 0.25 g/100 g cholesterol (lc diet) or the lc diet in which cellulose was partially replaced (2.5 g/100 g) by prickly pear pectin (lc-p diet). the lc-p diet lowered plasma ldl cholesterol concentrations by 33% (p < 0.001). low density lipoprotein composition was modified by intake of prickly pear pectin; the relative percentages of free and esterified c ... | 1992 | 1333520 |
| [demonstration of sensor nervous endings in the rat thyroid gland]. | the nerve sensitive endings or receptors of the thyroid gland have been studied in twenty adult male rats. their morphology, their acetyl-cholinesterase specific activity, their mono-amino-oxidase activity and vip were investigated. few but constant nerve sensitive endings were observed in the thyroid gland. these receptors were subdivided by their morphology in the next groups: pear-shaped receptors with capsule; capsuled spherical receptors located near vascular walls; ovoidal receptors with c ... | 1991 | 1366352 |
| expression of erwinia amylovora hrp genes in response to environmental stimuli. | seven hrp loci that are essential for the hypersensitive reaction elicited by erwinia amylovora were transcriptionally fused with a derivative of transposon tn5, containing the promoterless escherichia coli beta-glucuronidase reporter gene. the seven hrp fusions were used to monitor expression of the hrp loci in vitro and in planta. no significant expression was detected in rich medium for any of the fusions. however, five of them were expressed highly in planta and in inducing medium that conta ... | 1992 | 1372313 |
| pear blister canker viroid is a member of the apple scar skin subgroup (apscaviroids) and also has sequence homology with viroids from other subgroups. | the sequence of pear blister canker viroid (pbcvd), the putative causal agent of pear blister canker (pbc) disease, has been determined. pbcvd consists of a single-stranded circular rna of 315 nucleotide residues which assumes a branched conformation when it is folded in the model of lowest free energy. pbcvd has highest sequence similarity with grapevine 1b viroid (52.4%), but also contains sequences related to regions present in viroids that belong to different subgroups, suggesting that pbcvd ... | 1992 | 1383394 |
| experimental life history of spirometra erinacei. | the complete life cycle of spirometra erinacei has been experimentally maintained in the laboratory. the cyclops were reared as the first intermediate host, and the tadpoles of rana nigromaculata as the second intermediate host. icr mice were used as another second host. the experimental definitive hosts were dogs and cats. maturation and hatching of the eggs took 8 to 14 days by incubation at 29 degrees c. the coracidium measured 43.8 x 36.9 microns. mesocyclops leuckarti and eucyclops serrulat ... | 1990 | 2095198 |
| effect of the new spacer-device on the deposition of the inhaled metered dose aerosol. | the effect of the new spacer-device on the in vitro and in vivo deposition of inhaled drug particles was studied. the in vitro deposition of beclomethasone dipropionate 250 micrograms/dose aerosol administered either through the conventional aerosol actuator with the short plastic mouthpiece or through the new pear-shaped spacer-device was evaluated with the modified cascade impactor method. for the in vivo study the disodium cromoglycate particles were labelled with a pure gamma-radiator 99mtc ... | 1990 | 2129249 |
| pilum pilum gen. et sp. n. (acanthocephala: echinorhynchidae) from freshwater fishes of the southeastern united states. | pilum pilum gen. et sp. n. is described from the warmouth, lepomis gulosus (cuvier); brown bullhead, ictalurus nebulosus (lesueur); yellow bullhead, i. natalis (lesueur); redbreast sunfish, l. auritus (linnaeus); bluegill, l. macrochirus rafinesque; spotted sunfish, l. punctatus (valenciennes); and redfin pickerel, esox americanus (gmelin), from the alabama river drainage, brown bullhead from the mobile bay drainage in alabama, and pirate perch, aphredoderus sayanus gilliams, from an atlantic co ... | 1976 | 1255353 |
| a new species of the genus bullera derx. | a new yeast species, bullera piricola, is described. the three strains studied were all isolated from the pear phylloplane. this species differs from all bullera species known at present by forming symmetrical as well as asymmetrical ballistospores. the problem of its integration into the genus bullera derx is discussed. an amended diagnosis of the genus bullera is given. | 1975 | 1083203 |
| gross, histomorphological and histochemical changes in thyroid gland of goat with age. ii. occurrence of ultimobranchial follicles. | occurrence and histomorphology of ultimobranchial follicles in the thyroid glands of 26 goats of six different age groups (ranging from 20 days to above five years) was studied. the occurrence of ultimobranchial follicles was 38.46%. in 15.38% of the cases, it was found with and in 23.08% without any association of the thymic tissue. its association with parathyroid tissue has also been recorded in one of the goats aged 7 months 11 days. their size and shape varied greatly and were narrow and wi ... | 1978 | 637309 |
| 6;7 chromosomal translocation in spontaneously arising rat immunocytomas: evidence for c-myc breakpoint clustering and correlation between isotypic expression and the c-myc target. | our previous studies have shown that spontaneously arising immunocytomas in the lou/ws1 strain of rats contain a t(6;7) chromosomal translocation in all seven tumors studied (f. m. babonits, j. spira, g. klein, and h. bazin, int. j. cancer 29:431-437, 1982). we have also shown that the c-myc is located on chromosome 7 (j. sümegi, j. spira, h. bazin, j. szpirer, g. levan, and g. klein, nature (london) 306:497-499, 1983) and the immunoglobulin h cluster on chromosome 6 (w.s. pear, g. wahlström, j. ... | 1988 | 3122026 |
| the rcsa gene from erwinia amylovora: identification, nucleotide sequence, and regulation of exopolysaccharide biosynthesis. | rcsa is a positive activator of extracellular polysaccharide synthesis in the enterobacteriaceae. a cosmid clone containing the rcsa gene from erwinia amylovora was identified by its ability to restore mucoidy to an e. stewartii rcsa mutant. the rcsa gene was subcloned on a 2.2-kilobase hindiii-psti fragment that hybridized with an e. stewartii rcsa probe and complemented e. stewartii and escherichia coli rcsa mutants. in addition, the cloned e. amylovora rcsa gene stimulated expression of cps:: ... | 1990 | 2131100 |
| pectin isolated from prickly pear (opuntia sp.) modifies low density lipoprotein metabolism in cholesterol-fed guinea pigs. | the effect of prickly pear soluble fiber on low density lipoprotein (ldl) metabolism was investigated by feeding male guinea pigs either a nonpurified diet containing 0.25% cholesterol (hc diet) or the hc diet + 1% prickly pear pectin (hc-p diet). plasma cholesterol levels were significantly decreased by the hc-p diet, with a 33% decrease in ldl levels (p less than 0.02) and an increase in ldl density. hepatic free and esterified cholesterol levels were reduced 40 and 85%, respectively (p less t ... | 1990 | 2231018 |
| auditory epithelial migration on the human tympanic membrane: ii. the existence of two discrete migratory pathways and their embryologic correlates. | the pathways of movement of dye-markings on the tympanic membranes of 30 ears of 15 volunteers were investigated by photography with a hopkin's rod. two discrete pathways were identified. movement on the pars tensa was centrifugal in all directions from the edge of the handle of malleus surface. this supported our previous suggestion that pars tensa epithelial migration is based on growth of the meatal plate. movement on the more central part of the handle surface itself, however, was always upw ... | 1990 | 2260527 |
| structural and antigenic analysis of chlamydia pneumoniae. | several isolates of chlamydia pneumoniae were compared with each other and to chlamydia trachomatis and chlamydia psittaci by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblots. protein profiles of the c. pneumoniae isolates appeared to be the same and were distinct from the other chlamydia species. a 39.5-kilodalton (kda) protein, similar in molecular weight to the major outer membrane proteins (momp) of c. trachomatis and c. psittaci, was found in the sarkosyl-insoluble ... | 1990 | 2294060 |
| the effect of whole ejaculate filtration on the morphology and the fertility of bovine semen. | a sephadex g-15 filtration method was developed to remove abnormal and nonmotile bull sperm from an entire ejaculate. the efficiency of filtration was determined by adding freeze-killed sperm to the ejaculate or using ejaculates with elevated numbers of abnormal cells induced by scrotal insulation. a fertility trial, using split ejaculates, compared fertility of filtered and unfiltered semen. after filtration, samples with 0, 25, and 50% killed cells added contained 77 to 81% motile cells. addit ... | 1990 | 2312886 |
| morphology of the human olfactory epithelium. | the human olfactory epithelium has been previously studied with scanning electron microscopy; however, most studies have been limited to examining the epithelial surface. in an attempt to examine structures below the surface, we scanned epithelial fractures that occurred during tissue preparation. this made it possible to obtain unique three-dimensional images of cell profiles from the mucosal surface through the full depth of the epithelium. we examined supporting cells, olfactory neurons, basa ... | 1990 | 2376627 |
| negative staining of myosin molecules. | a reproducible method has been developed for the negative staining of myosin molecules. the dimensions of stained molecules are in close agreement with those obtained by metal shadowing. sharp bends in the tail, indicative of hinge regions, were observed at two positions 44 nm and 76 nm from the head-tail junction. the tail was often ill-defined at the position of the first (44 nm) bend. the bend positions may be sites of proteolytic cleavage that result in the production of long and short myosi ... | 1985 | 2413217 |
| types of neurons in nucleus olivaris inferior of the european bison. | the studies were carried out on the medullae oblongatae of four european bisons. preparations made by means of the golgi technique, as well as preparations stained by the klüver-barrera methods, were used. two types of neurons were distinguished in nucleus olivaris inferior of the european bison. type i (about 90% of neurons) are multipolar cells whose perikaryons measure from 25 to 40 microns. the multipolar cells generate 5-6 thick dendrites which next give off a number of branches. the dendri ... | 1988 | 2458411 |
| distribution of somatostatin and glucagon immunoreactive cells in the gastric mucosa of some cartilaginous fishes. | the comparative distribution of somatostatin- and glucagon-like-containing cells in the histomorphologically different gastric mucosae of the cartilaginous fishes heptranchias perlo, raja asterias, scyliorhinus canicula, squatina aculeata, and torpedo marmorata was immunocytochemically studied to demonstrate a possible interrelationship between these endocrine cells and/or other endocrine or nonendocrine cells. in the gastric mucosa, these open-type glucagon and somatostatin immunoreactive cells ... | 1989 | 2570006 |
| a case of calcitonin-producing parathyroid adenoma with primary hyperparathyroidism. | a 57-year-old female was admitted to our hospital with general lassitude, loss of appetite, nausea, upper abdominal pain, thirst, polydipsia and polyuria. on admission, she had an asymmetrical pear-shaped tumor in the right supraclavicular region and severe hypercalcemia. plasma c-pth was elevated to 22.72ng/ml. plasma calcitonin was also elevated to 336 pg/ml. she died of respiratory and cardiac failure of two weeks after admission without any positive response to the treatment, including hemod ... | 1989 | 2585894 |
| organization of ribosomal rna genes in alternaria alternata japanese pear pathotype, a host-selective ak-toxin-producing fungus. | dna encoding ribosomal rna (rrna) of alternaria alternata japanese pear pathotype has been cloned in lambda replacement vector, lambda fix. restriction endonuclease mapping and southern hybridization with the 18s and 28s rrnas of saccharomyces cerevisiae revealed the a. alternata rdna to be tandemly repeating 8.15-kilobase pair unit. the restriction fragments of the unit were then subcloned in the plasmid vector bluescribe m13- and partially sequenced. the determined sequences were compared with ... | 1989 | 2697467 |
| monospermy and polyspermy after partial zona dissection of reinseminated human oocytes. | partial zona dissection (pzd), a zona drilling method that uses mechanical force to open the zona pellucida while the oocyte is shrunken in a sucrose solution, was applied to 121 unfertilized 1-day-old mature human oocytes prior to reinsemination. the 115 surviving oocytes were divided into three groups in which the duration between sucrose addition and reinsemination was varied: i) less than 20 minutes, ii) 21 to 45 minutes, and iii) longer than 45 minutes. there was a trend toward a reduced fe ... | 1989 | 2777173 |
| unique ultrastructure in the elementary body of chlamydia sp. strain twar. | the ultrastructure of two prototype strains (tw-183 and ar-39) of chlamydia sp. strain twar was described. the twar elementary body (eb) demonstrated a unique morphology and structure distinct from those of other chlamydial organisms. it was pleomorphic but typically pear shaped. the average size was 0.38 micron, with a long axis of 0.44 micron, a short axis of 0.31 micron, and a ratio of the long to the short axes of 1.42. the cytoplasmic mass was round, with an average diameter of 0.24 micron. ... | 1987 | 3611029 |
| ultrastructural development of leishmania chagasi in its vector, lutzomyia longipalpis (diptera: psychodidae). | the development of leishmania chagasi, etiologic agent of american visceral leishmaniasis, was studied by light and electron microscopy in the gut of the sand fly, lutzomyia longipalpis, a natural vector. new aspects of suprapylarian leishmania behavior were elucidated. in the sand fly midgut, amastigotes transformed into promastigotes (division promastigote i) during a first division sequence within the bloodmeal. secondary division of these promastigotes resulted in a second form (division pro ... | 1989 | 2802019 |
| tyrosine hydroxylase immunohistochemistry fails to demonstrate dopaminergic interplexiform cells in the turtle retina. | a number of catecholaminergic, presumably dopaminergic, cells could be observed in the turtle retina, because of their tyrosine hydroxylase immunoreactivity. they were amacrine cells with a pear-shaped soma and dendrites distributed in 3 sublayers within the inner plexiform layer. neither sclerally directed th-positive processes nor terminals in the outer plexiform layer were observed, suggesting that dopaminergic interplexiform cells do not exist in the turtle retina. | 1985 | 2862955 |
| ultrastructural biology of leishmania (viannia) panamensis (=leishmania braziliensis panamensis) in lutzomyia gomezi (diptera: psychodidae): a natural host-parasite association. | the development of leishmania (viannia) panamensis in a natural sand fly host, lutzomyia gomezi, was studied by light and transmission electron microscopy. new aspects of peripylarian parasite behavior and morphology in the sand fly gut, early bloodmeal stages, and ultrastructural development in the anterior gut were documented. eight distinct morphological forms were observed in the life cycle of the parasite within the insect. in the bloodmeal, amastigotes (1) transformed into stumpy promastig ... | 1989 | 2916730 |
| crystallization of the ca2+-atpase of sarcoplasmic reticulum by calcium and lanthanide ions. | two-dimensional crystalline arrays of ca2+-atpase molecules develop in sarcoplasmic reticulum vesicles exposed to ca2+ or lanthanide ions. the ca2+- or lanthanide-induced crystals are presumed to represent the e1 conformation of the ca2+-atpase, and their crystal form is clearly different from the earlier described e2 crystals induced by na3vo4 in the presence of ethylene glycol bis(beta aminoethyl ether)-n,n,n',n'-tetraacetic acid (taylor, k. a., dux, l., and martonosi, a. (1984) j. mol. biol. ... | 1985 | 2931429 |
| glutamic acid decarboxylase (gad)-immunoreactive structures in the adult human lateral geniculate nucleus. | the distribution of glutamic acid decarboxylase (gad)-like immunoreactivity in the lateral geniculate nucleus (lgn) of the human adult was studied in vibratome sections (50-60 microns thick) using the avidinbiotin-peroxidase method. the tissue was obtained at autopsy from five individuals without any known neurological disorders. only few gad-immunoreactive neurons were present in the layers of the lgn, even less in the interlaminar zones. the numerical density of gad-immunoreactive neurons and ... | 1991 | 2035846 |
| three-dimensional reconstruction of negatively stained crystals of the ca2+-atpase from muscle sarcoplasmic reticulum. | the structure of the ca2+ transport atpase from rabbit skeletal muscle sarcoplasmic reticulum has been determined to 25 a resolution by three-dimensional image reconstruction of crystalline membrane tubules induced through exposure to na3vo4 and preserved for electron microscopy in negative stain. the crystalline arrays have projection symmetry p2 and consist of chains of ca2+-atpase dimers arranged in a right-handed helix. the density map shows protein features that project from the membrane su ... | 1986 | 2939255 |
| identification of a new viroid as the putative causal agent of pear blister canker disease. | a small rna species with the structural and functional properties characteristic of viroids has been isolated from three different pear sources each of which induced symptoms of the pear blister canker (pbc) disease when indexed in the pear indicator a 20. a close association between this rna and pbc disease was established, since two of the three studied sources were known to be affected by this malady only, and the viroid was not detected in healthy pear tissue. moreover, the pbc-associated vi ... | 1991 | 2045786 |
| stereographic and stereometric study of sebaceous gland hyperplasia in rabbit pinnas induced by topically applied substances. | tetradecane (td), testosterone (ts), and dimethyl sulfoxide (dmso) were separately inuncted on rabbit pinnas once a day; the pinnas were biopsied on days 1, 3, 7, and 28. untreated pinnas and squalane-treated pinnas were used as controls. three-dimensional images of sebaceous glands were reconstructed from their serial histologic sections using a computer-image analysis system. by stereometry, the sebaceous gland volumes gradually increased during the course of treatments with ts and dmso, where ... | 1991 | 2056196 |
| occurrence of lipofuscin pigment granules and "dense microspheres" in the spinal cord of young cats treated with beta,beta'-iminodipropionitrile (idpn). | spinal cords of cats treated with the neurotoxic compound beta,beta'-iminodipropionitrile (idpn) were observed to contain rounded homogeneous bodies, 1-12 microns in diameter, termed "dense microspheres" (dms). these bodies, absent in control animals, were consistently found only in the ventral horns. no relationship with blood vessels was evident. when stained with pas and a modified von kossa's silver nitrate technique, dms remained negative, showing only very slight metachromasia in some tolu ... | 1988 | 2980224 |
| characteristics of the conidia produced by the mycelial form of paracoccidioides brasiliensis. | the sporulation capacities of the mycelial form of paracoccidioides brasiliensis were determined. five different culture media were used and four human isolates studied. conidia were produced in three agar media, namely water-agar, glucose-salts and yeast-extract. corn meal and sabouraud dextrose agars failed to induce sporulation. various types of spores were characterized with peculiar bulging arthroconidia and single-celled, pear-shaped conidia predominating. the size of these conidia varied ... | 1985 | 4095647 |
| purification and characterization of the inducible a agglutinin of saccharomyces cerevisiae. | a cell surface glycoprotein induced by the mating pheromone alpha factor in saccharomyces cerevisiae a cells has been purified to homogeneity. at 4 x 10(-9) m it strongly inhibits mating-type-specific agglutination between a and alpha cells. the protein is solely o-glycosylated. it consists of 29% carbohydrate and its apparent molecular mass is 22 kd on sds gels. after hf treatment it behaves like a protein of 13 kd; therefore its true molecular mass probably is close to 18 kd. mild periodate tr ... | 1988 | 3044782 |
| new antibacterial agent isolated from the avocado pear. | a group of eight new long-chain aliphatic compounds recently isolated from the avocado and some derivatives thereof were tested for antibacterial activity on 13 different species of bacteria and a yeast. some of these compounds inhibited the growth of microorganisms. 1,2,4-trihydroxy-n-hepadeca-16-en was found to be the most active, inhibiting certain gram-positive bacteria at 4 mug/ml. | 1970 | 4985830 |
| localization of the rat immunoglobulin lambda light chain locus to chromosome 11. | previous experiments using rat/mouse somatic cell hybrids have localized the rat c-myc gene to chromosome 7 (sümegi et al. 1983), the rat immunoglobulin kappa locus to chromosome 4 (perlmann et al. 1985), and the rat immunoglobulin heavy chain locus to chromosome 6 (pear et al. 1986). using a similar approach, we now report the localization of the rat immunoglobulin lambda light chain locus to chromosome 11. | 1988 | 3137157 |
| the morphology of human immunodeficiency virus (hiv) by negative staining. | we have examined preparations of human immunodeficiency virus 1 (hiv-1) and hiv-2 by negative staining electron microscopy. hiv-2 cultures contained large numbers of 130-200 nm particles containing a 130-nm-long by 30-70 nm-wide core. this core is probably of conical or pear-shaped morphology. some particles exhibited a short fringe that could be seen to comprise a regular arrangement of repeating subunits when visualised end on. identical particles were found in hiv-1 cultures but in much lower ... | 1988 | 3171554 |
| mycoplasma-like bodies in the pear psylla vector of pear decline. | | 1971 | 5543285 |
| [isolation and investigation of the pear bacteriosis agent in the western regions of the ukrainian ssr]. | | 1968 | 5734161 |
| the ventral metacarpo- and metatarso-phalangeal sesamoid bones: comparative anatomy and evolutionary aspects. | a study of comparative anatomy was made to determine the distribution of metapodo-phalangeal sesamoid bones among the different mammalian species for a better understanding of the variations and origins of these bones in man, and that in the context of renewed interest in non-metrical characteristics of the post-cranial skeleton in physical anthropology. the material used included 457 non-primate mammalian skeletons divided into 18 orders, 63 families, and 161 genera, 211 non-human primate skele ... | 1988 | 3224803 |
| [behavior of bronchial reactivity in 50 children before and after exclusion of food allergens]. | in this study the author has purposed to demonstrated that the food allergens increase the bronchoreactivity. this studied group was formed by 50 boys with chronic rhinitis and/or nasal perennial and/or laryngeal and bronchial obstruction, unresponsive to aeroallergens but responsive to food allergens determined with fbst test. this test is performed by making the patient go on an anallergic diet (formed by tapioca's flour, rabbit, olive oil, beets, lettuce, pear, sugar, salt for seven days). th ... | 1988 | 3244541 |
| the oral allergy syndrome. | we have studied 262 patients suffering from hay fever and oral allergy syndrome after fruit and vegetable ingestion. the history and the results of rast and skin test for pollen showed a contemporary presence of systemic and local symptoms in most of the patients; a close connection between age of onset of hay fever and oral allergy syndrome; a frequent association between allergy to some pollens and some vegetables, such as between apple, carrot, pear, cherry with birch pollen and tomato, melon ... | 1988 | 3264668 |
| induction of heterothallic strains and their genetic and physiological characterization in a homothallic strain of the yeast saccharomyces exiguus. | we isolated heterothallic strains from a homothallic strain of s. exiguus by mutagenization with uv or ethylmethanesulfonate (ems). a gene, not linked to the mating-type locus, was found to control homothallism in the yeast, as in s. cerevisiae. alpha pheromone of s. exiguus (alpha se pheromone) induced formation of large pear-shaped cells (shmooing) in alpha strains of s. exiguus, s. cerevisiae, and s. kluyveri, and sexual agglutinability of an inducible alpha strain of s. cerevisiae. alpha se ... | 1986 | 3447742 |
| tectal neurons of the frog: intracellular recording and labeling with cobalt electrodes. | with the aid of cobalt-filled intracellular electrodes, responses evoked by electrical and visual stimulation were recorded from tectal neurons. diffuse light and "edge" and "spot" stimuli were used for visual stimulation; electrical stimuli were delivered by means of bipolar electrodes to the optic tract. the cells were subsequently filled with cobalt for a correlative histological study. the following types of neurons were distinguished: (1) pear-shaped neurons with restricted and broad dendri ... | 1986 | 3485664 |
| differential response to environmental alcohol among second-chromosome arrangements in experimental populations of drosophila buzzatii. | drosophila buzzatii feeds and breeds on the decaying cladodes and fruits of several species of opuntia (prickly pear) which contain significant levels of ethanol and isopropanol. the potential influence of these two alcohols on the inversion polymorphism of the second and fourth chromosomes was investigated in ten experimental populations with different amounts of alcohol (either ethanol or isopropanol) added to the culture medium. all populations were started with the offspring of 29 wild femal ... | 1987 | 3505227 |
| radiation preservation of foods of plant origin. part v. temperate fruits: pome fruits, stone fruits, and berries. | the current status of research on the application of ionizing radiation for improving the storage of temperate fruits, i.e., apple, pear, peach, nectarine, apricot, cherry, plum, strawberry, bilberry, cranberry, raspberry, and black currant, is reviewed. changes in fruit metabolism, chemical composition, texture, and organoleptic quality attributes are discussed with reference to the irradiation dose. the feasibility of using radiation either alone or in conjunction with heat treatment, refriger ... | 1986 | 3536313 |
| a morphometric study of the growth of the subglottis after endolaryngeal trauma. | in young rabbits the growth of the subglottis was studied over a period of 20 weeks following an endolaryngeal trauma. this lesion of the larynx at the age of 4 weeks resulted in the development of a stenosis in the adult stage. the stenosis appeared to be caused by a specific change in the pattern of growth leading up to an anterior narrowing ('pear'-like) of the cricoid ring and a conspicuous thickening of the subepithelial layer. | 1986 | 3570686 |
| effect of tetraploidy on dendritic branching in neurons and glial cells of the frog, xenopus laevis. | morphological aspects of four different groups of golgi impregnated brain cells from a tetraploid strain of xenopus laevis frogs were compared to analogous cells in comparably sized diploid frogs. the cells examined included neurons from the telencephalon, caudal hypothalamus, and optic tectum, and radial glial cells from the optic tectum. the brains of tetraploid frogs appeared grossly normal and were the same size and contained similar cell types as diploid brains. as observed in previous stud ... | 1987 | 3584543 |