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At least 1,387 records · Page 77Linked to original sources
PubMed2003

[Overwintering and size dynamic characters of Apis cerana cerana].

A systematic observation and research was conducted on the overwintering and size dynamic characters of Apis cerana cerana at south and west mountaneous area of Anhui Province in 1998-2003. The results showed that the center temperature of overwintering bee flock changed synchronously with the outside temperature. With the decrease of overwintering bee colony, its center temperature and relative humidity ranged widely, and stably descended. Overwintering flocks fed by old method had a high stability than that fed new one. Among overwintering bee bred in Autumn, the glands of work bee were in initial stage, the descending rate of colony was low, the bee colony kept in quiet, the forage consumption was small, and the colony kept in high stability. Cutting off offspring by imprisonment improved the quantity and quality of right age overwintering bee, and the age structure of each bee population was variable. Under new feeding method of Apis cerana cerana seasonal management, the skill of breeding right age overwintering bee flock and the cutting off offspring by imprisonment should be undertaken.

Animals↗
PubMed2003

[Testing research of achromatic phase retarder's spectral character].

Using established testing system by principle of normalized polarizing modulation, we measured the spectral characters of normal Fresnel rhomb, improved Fresnel rhomb, oblique-incidence rhomb and rectangle prism compound rhomb phase retarders. Through the measured spectral we yield the characteristic achromatism curves of all kinds of achromatic phase retarders, and analyse the results. The results indicate that the achromatism of the improved Fresnel rhomb and rectangle prism compound rhomb phase retarders is superior to others. Currently the improved Fresnel rhomb and retangle prism compound rhomb phase retarders are the ideal and utility-type achromatic phase retarders.

English Abstract↗
PubMed2002

[Studies on correspondence between catalytic activity and fluorescence spectra character of macrocyclic dioxotetramine complexes].

In this paper, the conventional fluorescence spectra and laser induced fluorescence spectra of a novel macrocyclic dioxotetramine, 1,4,7,10-tetraazacyclotridecane-11,13-dionato and its Cu(II), Co(II), Ni(II) complexes at different pH are studied. The results show that the complexes fluorescence quantum yields have the relation of phi CuL5 < phi CoL5 < phi NiL5. At the same time, the reasonable explanation is given. The correspondence between their catalytic activities and fluorescence spectra character as minic superoxide dismutase metalloenzynes are also analyzed. It has been found that the fluorescence quantum yield of CuL5 decreases when the pH gets higher. But it is on the contrary for CoL5 and NiL5. It has been inferred that catalytic activities may be CuL5 > CoL5 > NiL5 according to their fluorescence quantum yield.

English Abstract↗
PubMed2003

[Influence of genotype on endoreduplication of giant chromosomes and expressivity of character eyeless in Drosophila melanogaster].

In Drosophila melanogaster lines LA (low activity), HA (high activity), and Oregon-R (wild type), the effect of genetic background on endoreplication in giant chromosomes of salivary glands, fecundity, and expression of mutation ey was studied. The degree of chromosome polyteny and the number of adult flies in saturated lines eyHA, eyBA, and eyOr were significantly higher than in the original lines. The degree of chromosome polyteny was correlated with fecundity. The expressivity of the ey character was shown to be far lower in lines eyLA, eyHA, and eyOr than in the original eyeless line. In the saturated lines, the eye facets were reduced to a similar degree. All the lines studied displayed clear-cut sexual distinctions in this parameter. In the eyHA line, the coefficients of variation for the degree of chromosome polyteny, fecundity, and expressivity of the ey mutation were much lower than in lines eyeless, eyLA, and eyOr.

Animals↗
PubMed2003

[Comparison and analysis of the molecular character of breakpoints in introns of deletion hotspots of dystrophin gene].

OBJECTIVE: To study the exons deletion mechanisms for dystrophin gene, the molecular characters of breakpoints of junction fragments for deletion-type Duchenne muscular dystrophy (DMD) patients with 46 and 51 exons deletion were compared and analyzed. METHODS: Deletion-type DMD patients were detected by multiplex polymerase chain reaction(mPCR). The breakpoints of junction fragments with 46 and 51 exons deletions were cloned and sequenced respectively. RESULTS: Analysis of sequences of deletion-junction fragment of exon 46 showed that the 5'breakpoint was located in AT-rich region of intron 45 and the 3' breakpoint was in medium reiteration repeats (MER1) sequence. There existed 2 bp(ta) junction homology between two breakages. No small insertion, small deletion or point mutation was located near the junction point. Similarly, analysis of sequences of deletion-junction fragment of exon 51 showed that the 5 breakpoint was located in transposon-like human elements (THE1) of intron 50 and the 3' breakpoint was in L2 sequence. There existed 3 bp(cta) junction homology between two breakages. No small insertion, small deletion or point mutation was located near the junction point. By analyzing the secondary structure of junction fragments with 46 and 51 exons deletions, it was demonstrated that all breakpoints of junction fragments were located at the non-matching regions of single-strand hairpin. CONCLUSION: By comparing the junction fragments with 46 or 51 exons deletion, it was found that all of breakpoints were located in repeat sequences and the repeat sequences formed the single-strand hairpin which could make the introns instable and result in exon deletion.

Base Sequence↗
PubMed2003

[Studies on the blood group serologic characters of enzyme-only red cell antibody].

The objective of this study was to investigate the serologic characters of enzyme-only red cell antibody and its clinical significance, and to provide basis for the safety of blood transfusion. The patient serum containing enzyme-only antibody was used to react with the red cells of donors, panel cells and auto-cells in various medium. Absorption and elution test were also per formed. The results showed that this blood sample was found to contain an antibody that reacted with donor red cells and panel cells only in papain medium, but was not demonstrable by indirect antiglobulin test and other method s. Decline of antibody titers was observed after absorption test, but antibody activity was not detected in the elute. The patient underwent transfusion with 600 ml of Rh type identical RBCs, without any hemolytic transfusion reaction. In conclusion, enzyme-only antibody usually doe s not lead to hemolytic transfusion reaction.

Aged↗
PubMed2003

[Relationship between calcium content and its character in fetal tissues and calcium deficiency of minor].

In order to probe the relationship between calcium content and its status in fetal tissue and minor's calcium deficiency, the calcium content of seven tissues of fetus aged 4 to 10 month was measured and analyzed. Results showed that the calcium content in fetal tissues was an unstable variable, and it was a function of spatio-temporal factors. Calcium content in fetal tissues reduced with the increase of age and weight of tissue, making a continuous decrease of the calcium content in per gram tissue. This characteristic could last to about the age of 20 years old of children. The physiological character that calcium content in tissues of fetus and minor decreases with the development can make people to be more aware to calcium deficiency, laying the physiological basis of calcium deficiency of the people in low age, providing the physiological information for adjusting and controlling the calcium nutrition of the fetus, minor and pregnant woman.

Adult↗
PubMedDate not supplied

[Organization and execution of surveillance of the sanitary and epidemiologic situation under conditions of the emergency situation of a natural character].

The data on the work of the formations and institutions of the sanitary and epidemiological service of the Republic of North Ossetia-Alania under the conditions of the emergency situation of the natural character (high floods) in June 2002 and the liquidation of its consequences are presented. Experience in ensuring the interaction between the formations of the sanitary and epidemiological service on the problems connected with the realization of the epidemiological surveillance in the territories affected by the natural calamity is described.

Communicable Disease Control↗
PubMed1951

Pulmonary segmental resection for solitary lesions of doubtful character.

Pulmonary cancer can be diagnosed earlier if patients with pulmonary symptoms of chronic type are given x-ray examination early, if patients over 40 years of age have a yearly roentgen examination of the chest regardless of their state of health, and if those with acute pulmonary illness are examined by x-ray within one month of the onset of illness. Observation of a known intrapulmonary lesion of unknown character should never last for more than one month. If it persists after that period, complete investigation, including thoracotomy, should be carried out if necessary to establish an exact diagnosis. A localized intrapulmonary lesion can be removed by segmental resection so that all healthy functioning lung is conserved if the disease is benign. If, after pathological examination, the lesion is shown to be cancerous, more radical resection can be carried out.

Female↗
PubMed2004

[Etiology and clinical characters of hepatitis caused by non-hepatotropic virus].

OBJECTIVE: To explore the etiology and clinical characters of hepatitis caused by non-hepatotropic virus. METHODS: 68 non-hepatotrophic viral hepatitis patients with negative anti-HAV-anti-HEV were diagnosed by detecting antibodies of anti-HSV IgM, anti-EBV IgM, anti-CMV IgM, anti-CSV IgM and anti-ANA, anti-mitochondrion antibody. Their clinical symptoms and signs were compared with that of acute viral hepatitis patients at the same time. RESULTS: Among the 68 patients, 9 were infected by HSV, 12 by EBV, 8 by CMV, 14 by CSV, and the other 13 patients and 12 patients were positive for anti-ANA and anti-mitochondrion antibody, respectively. 35 of 43 non-hepatotrophic viral hepatitis patients were infected in winter and spring season. Their clinical symptoms and signs were milder than that of acute viral hepatitis patients. CONCLUSION: Liver damage and dysfunction may be the prominent phenomenon during HSV, EBV, CMV and CSV infection, just like that of acute viral hepatitis but with milder clinical symptom and signs.

Adult↗
PubMed2004

[Vertical distribution character of nutrient elements in peat of Sanjiang Plain].

Based on the methods of sampling in winter and dividing soil layer on the site, the vertical distribution character of normal amount nutrient elements N, P, Mg, Ca, Fe and nutrient trace elements Cu, Zn, Mn, B in peat of river bed-flood land and valley depression land in the Sanjiang Plain was studied systematically. The results showed that TN was accumulated in surface layer of peat, and TP was accumulated in root layer. The contents of TN and TP were decreased with the section depth increasing. Zn, Mn, B, Mg and Fe were gathered in root layer and accumulated sharply in gley horizon of silt sub-clay, and the content of Ca was regular relatively in each layer of section. There were close correlations among some nutrient elements in peat section.

Calcium↗
PubMed1993

[The characters on histopathological changes in dental fluorosis]

The microradiography SEM and TEM were used ton observe histopathological changes in dental fluorasis with various degrees in this study.The characters of histopathological changes of dental fluorasis are:(1) the lesios appear in exterior layer of enamel,not excess one third enamel.(2)the future of the lesion is enamel-hypoplasia,enamel rods were hypomineralized.the space among enamel rods widen and form some cavities.There are a lot of spaces in intercrystlines.Many micropores and injures exhibit on enamel surface.(3)the clinic severe degree of lesion is similar to the histopathological changes.It could be indicated using the Dean's and the TF index.

Journal Article↗
PubMed2004

[Speciation and distribution characters of rare earth elements in the Baotou Section of the Yellow River].

As a whole of water column, suspended matter and surface sediment in the mainstream and the branch taking up industry wastewater, speciation and distribution characters of rare earth elements (REEs) were investigated systemically in the Baotou section of the Yellow River. This study shows that rare earth elements in the mainstream of the Baotou section of the Yellow River mainly exist in suspended particles, and the dissolved contents are in extremely minute quantities. REEs mainly exist in dissolved particles in the branch taking up industry wastewater, and suspended sigma REE and dissolved sigma REE are obviously higher than those in the mainstream. The change of sigma REE of dissolved particles in water phase along the Baotou section of the Yellow River is very similar to that of sigma REE of suspended particles, and consistent along the main river, it is that sigma REE increase appreciably from the control profile to the keystone discharged section, come to a head in the D site and reduce in the E site. This distribution pattern indicates pile industry wastewater of Baotou to rare earth elements in the mainstream of the Yellow River, particularly LREE. The REE distribution in the mainstream of the Baotou section of the Yellow River is the same, with LREE enrichment and Eu depletion. But LREE origin of D site is different from the other sites by excursion of LREE distribution curve and other geochemical parameters, they are origin of industry wastewater piled, otherwise the other four sites are origin of loess altiplano. And HREE are origin of loess altiplano in all the sites. The speciation characteristics of REE in the sediments and suspended matter are quite similar with the amount in as follows: residual >> bound to carbonates, bound to Fe-Mn oxides > bound to organic matter >> exchangeable. REEs exchangeable in surface sediment and suspended matter in the branch taking up industry wastewater are higher than those in the mainstream, it confirms that REEs in the mainstream mainly exist in suspended particles, and mainly exist in dissolved particles in the branch.

Geologic Sediments↗
PubMed2004

[Distribution and characters of soil dry layer in north Shaanxi Loess Plateau].

Based on a whole survey and detailed analysis in artificial Robinnia pseudoscacia forestland, distribution and characters of dry layer in soil were studied in north Shaanxi Loess Platea. The results showed that soil dry layer was distributed universally from south to north in Loess Plateau, which can be classified into four zones according to the dryness: 1) In southern gully zone represented by Ziwu Ridge and Huanglong Moutain in Yijun County, the soil dry layer was gentle, so if the appropriate measures were taken and water-saving facility were available or in water-abundant year, the shortage of soil water could be alleviated; 2) In northern gully zone represented by Fuxian and Huangling County, light soil dry layer occurs and was getting worse and we should pay close attention to this; 3) In the large hill and gully zone, serious dry layer appears, it could be subdivided into south, west and north plots. In south plot represented by Yanan and Yanchang County the dry layer was moderate; in west represented by Wuqi and Ansai County the dry layer was severe; in north represented by Suide and Mizhi County the dry layer was disastrous; 4) In the windy sand zone represented by Shenmu County, since the precipitation decreased drastically and seriously sandy, very grave soil desiccation appeared. Also, soil dryness showed apparent horizontal differences with rainfall and the apparent vertical gradient in small hill area.

Ecology↗
PubMed2004

The effect of water quality and NOM character on the ozonation of MIB and geosmin.

The ozonation of MIB and geosmin was studied in synthetic waters containing two natural organic material (NOM) fractions and sodium bicarbonate. The ozonation of both compounds was found to be affected by the character of the NOM fractions, with higher apparent rate constants observed in the fraction containing higher UV/visible absorbing properties. As the concentration of bicarbonate was increased, the destruction of both compounds decreased. MIB was found to be more resistant to ozonation than geosmin.

Camphanes↗
PubMed2004

[The basic characters and research advancements of odontoblasts].

As the main components of dental pulp cells,the odontoblasts were responsible for the formation and maintenance of dentin during the development and mature age of teeth. Presently the studies were mostly based on the two-dimensional vitro cultured technique,but with the developing research of pulp tissue, three-dimensional vitro cultured technique will be the study hotspot in future. The author retrospected the investigation about the odontoblasts these years and mostly expatiated the morphology,ultrastructure,function and characters of protein expression about the odontoblasts,including the research advancements and research aspects in future.

Dentin↗
PubMed2004

[Effect of restorative measures on quantitative characters of reproduction for Leynrus chinensis population in the degenerated grassland].

Studies on the reproductive characters of Leymus chinensis population in two plots showed that the density of L. chinensis population declined significantly in plowing plot, while the density of reproductive tillers varied insignificantly. The reproductive tiller had longer ear, longer inter-node, higher ratio of reproductive growth, higher seeding percentage, more ear-nodes, more spikelets, more florets and grains in plowing plot than in enclosing plot. The grain yield, net weight of grain, and the weight of 1000 grains was 2.68 times, 3.49 times and 1.3 times higher in plowing plot than in enclosing plot, respectively. The reproductive tillers with double-spikelet were 16% more in plowing plot than in enclosing plot, and they developed more double-spikelets. Relatively, the reproductive tiller in plowing plot developed few double-spikelets, more florets and more grains, so that, the grain yield of the population was enhanced largely. The reproductive allocations of L. chinensis didn't response differently to both plowing and enclosing at three module levels, including population to reproductive tiller, reproductive tiller to ear, and ear to grain, but the allocation of population to ear and to grain, and the allocation of reproductive tiller to grain were significantly higher in plowing plot than in enclosing plot.

Biomass↗