共查询到20条相似文献,搜索用时 15 毫秒
1.
Michael W. Maisch 《Geobios》2006,39(4):491
A three-dimensional well-preserved ichthyosaur skull and parts of the postcranial skeleton are attributed to the species Leptonectes tenuirostris (Conybeare, 1822). It was found vertically embedded in Pliensbachian deposits representing three successive biozones (ibex to margaritatus Zone). The find is dated as early Late Pliensbachian (margaritatus Zone) by a rich ammonite and ostracod fauna. It is the first record of the genus Leptonectes from Switzerland and from the Late Pliensbachian. It is so far the best preserved and most complete ichthyosaur from this time interval worldwide. With diagnostic specimens known from the Rhaetian (Late Keuper) up to the early Late Pliensbachian (Middle Liassic), L. tenuirostris (Conybeare, 1822) has the most extensive stratigraphic range documented for any post-Triassic ichthyosaur so far. 相似文献
2.
Sébastien Bernard-Guelle 《L'Anthropologie》2005,109(5):799-814
This article focus with recent studies realized on the Vercors Mountain about middle paleolithic site in altitude context. It proposes to make the synthesis of the data concerning the exploitation and especially circulation of the various types of flint inside and near this geographic area. This level of analysis makes it possible to discuss on the mobility degree of the mousterians groups in Vercors and to advance hypotheses on the settlement system within this territory. 相似文献
3.
Alain Beyneix 《L'Anthropologie》2007,111(1):68-78
The research presented in this paper is based on geographical zone chosen as context for a general discussion centred on a critical inventory of graves, burial places and funeral traditions within Neolithic communities between about 6000 and 2200 B.C. It proposes to define the characteristics and the evolution of funeral behaviours during the Neolithic times in Southern France, between about 6000 and 2200 B.C. Southern France has been considered in an extended definition, from Atlantic Ocean to the Alps, a territory constituted of 26 departments. In view of the extent of the territorial limits, the study was directly all-encompassing. It bears on 150 years of archaeological discoveries unevenly distributed on the Neolithic times. The study takes into consideration all the documentation published. The funeral traditions have been considered in the wide sense, that is tomb architecture, laying out and treatment of cadavers, study of archaeological artefacts. The study leads on to an interpretative outline of the funeral traditions whose development was closely linked to the social evolution of southern Neolithic communities. It researchs a social evolution beyond funeral behaviours, a power more and more destined to an elite who prefigures the protohistory. 相似文献
4.
Nena Nwachuku Charles P. Gerba 《Reviews in Environmental Science and Biotechnology》2008,7(3):267-273
Escherichia coli O157:H7 has been associated with water related outbreaks. It has been isolated from surface and ground waters. It is capable
of survival in water for days to weeks 相似文献
5.
Dalea conetensis, a new species from the central part of the State of Durango, Mexico, is described and illustrated. It is referred to Dalea subgenus Parosela sect. Parosela series Versicolores. It is morphologically similar to D. pinetorum var. pinetorum but can be distinguished by its shorter stipules, leaves, bracts, calyx teeth, petals, androecium, fewer and shorter leaflets,
and the calyx pubescence. 相似文献
6.
Aleksander Bielecki Joanna M. Cichocka Janusz Terlecki Andrzej Witkowski 《Biologia》2011,66(2):294-298
This study presents the parasitical relationships between the leech Piscicola respirans and European grayling Thymallus thymallus. It determines leech invasion intensity and extensity as well as describes the preferences of fin selection by the parasite
as a place to attach and feed. It also shows the significance of fin selection by the leech in the initial phase of life cycle.
Finally, the study defines P. respirans as a predominantly fin-parasite of fishes. Most probably the host-searching mechanism is based on positive phototaxis. 相似文献
7.
Microsatellite primers designed for American and European populations of the white campion and Nottingham catchfly were tested on white campion samples from six Ural populations. It was noted that the loci studied are represented by 2–43 alleles and the average observed heterozygosity varied from 11 to 100%. It was established that 2 of the 14 loci studied can be considered as markers for radiobiological studies. 相似文献
8.
9.
J.J Alcolea González 《L'Anthropologie》2003,107(4):471-500
It is our intention to analyse the environmental significance of the Palaeolithic artistic representations existing in the inner areas of the Iberian Peninsula. The fauna is used to create chronological and climatical criteria to affirm the condition of the castillan plateau during the last glaciation. In our opinion, it is dangerous to use the isolated animals in order to talk about coldness or heat situation because they reflect the cultural selection of their authors more than the ambiental reality. Neither the animals called thermometer nor the euritherm ones are solely represented in the tempered moments. Moreover, we have almost a no animal representation than artistic during the last finiglacial period in the peninsular interior. It means probably that the artistic representations are mainly cultural signs, which change for cultural reasons and not properly climatic ones within a general reality of glacial environment. 相似文献
10.
N. A. Ushakova S. V. Ponomarev Yu. M. Bakaneva Yu. V. Fedorovykh O. A. Levina A. V. Kotel’nikov S. V. Kotel’nikova A. I. Bastrakov A. A. Kozlova D. S. Pavlov 《Biology Bulletin》2018,45(4):382-387
It has been noted that the introduction of small doses of dry prepupae of Hermetia illucens flies into the diet of the young Mozambique tilapia Oreochromis mossambicus (0.5 g/kg feed) had a positive effect on the growth and development of fish. It was found that the average daily gain in the experimental group was 0.7 g. It was established that the blood biochemical parameters were within the norm in the fish of all groups; however, in the experimental tilapia, the erythrocyte sedimentation rate was significantly lower and a tendency to increase in the amount of hemoglobin and glucose was noted. It was revealed that in the seminiferous tubules of fish in the experimental group, the number of mature sperm was 5.9 times higher compared with the control, indicating an increase in the rate of spermatogenesis. It is assumed that the observed effects are due to the high content of manganese in the prepupae present in a biologically active divalent form. 相似文献
11.
The Jungwon region is located in the central part of Korea and it is one of crucial regions for understanding of the Korean Paleolithic culture. Many Paleolithic sites have been discovered in this region, from the lower Paleolithic to the upper Paleolithic. It is of interest the remarkable variety of archeological remains such as human bones, stone tools, animal bones and paleoenvironmental artifacts. As a result, it permits us to reconstruct the subsistence of prehistoric men. This region has an important role for Korean prehistoric researches. 相似文献
12.
The Suyanggae site is an open-air site in central part of South Korea. This site was discovered in 1980 and seven excavations have been carried out from 1983 to 1996. As a result, many stone artefacts were unearthed and 49 stone tool workshops were known. This site contains 5 cultural layers and the most important one is the Upper Paleolithic layer. This layer is dated to be 16,400 ~ 18,630 BP by 14C dating. It shows a massive blade production and microblade technique. It is one of the crucial sites for understanding the Upper Paleolithic of Korea. 相似文献
13.
Raymond M. Harley 《Kew Bulletin》2011,66(1):171-174
A new species of Lamiaceae from Belize: Hyptis maya is described and illustrated. It is closely related to the more widespread H. lanceolata Poir., with which it is compared. 相似文献
14.
15.
Resistance to butanol is a key factor affecting microbial ability to produce economically profitable amounts of butanol. In
this study, an Escherichia coli strain capable of growth in the presence of 1.5% butanol was isolated. The mutant MG1655 ButR was characterized by increased
resistance to ethanol, isopropanol, and bivalent ions but exhibited supersensitivity to osmotic shock. Compared to the wild
type strain, the butanol-tolerant mutant was more sensitive to antibiotics inhibiting protein synthesis but was more resistant
to membrane-penetrating antibiotics, such as surfactin. Increased content of unsaturated fatty acids was found in the membranes
of butanol-tolerant mutants. It was revealed that overexpression of the genes encoding cold-shock proteins decreased butanol
tolerance of both mutant and the wild-type strain. It was concluded that butanol tolerance was associated with multiple rearrangements
of the cell genetic system, rather than with single mutations. 相似文献
16.
In comparative fluorescence gel electrophoresis experiments, cross‐talk was detected. It was traced back to a failure in the quenching process in typical labelling protocols. Despite a huge excess of potential reaction sites for the N‐hydroxy‐succinimide–ester‐coupled dye, sufficient active dye molecules were available after the quenching step to label protein molecules un‐specifically. It could be shown that only a 100‐fold increase in the amount of quencher will silence residual dye to such an extent that no artificial signals are detected. 相似文献
17.
M. I. Bazarov 《Journal of Ichthyology》2011,51(9):794-798
According to trawl-acoustic surveys, differences in the range of diurnal vertical movements of bream Abramis brama in the Rybinsk and Ivankovo reservoirs are revealed. The observed fish behavior is related to strategy of occupation of feeding
biotopes. It is supposed that residence in bottom payers under conditions of low temperature is oriented to energy saving. 相似文献
18.
K. Magyar B. Szende V. Jenei T. Tábi M. Pálfi É. Szökő 《Neurochemical research》2010,35(12):1922-1932
Deprenyl has been discovered by Knoll and co-workers. The R-enantiomer of deprenyl (selegiline) is a selective and irreversible inhibitor of the B-isoform of monoamine oxidase (MAO-B)
enzyme. Due to its dopamine potentiating and possible neuroprotective properties it has an established role in the treatment
of parkinsonian patients. By inhibiting MAO-B enzyme, R-deprenyl decreases the formation of hydrogen peroxide, alleviating the oxidative stress also reduced by increased expression
of antioxidant enzymes (superoxide dismutases and catalase) reported during chronic treatment. It was shown to prevent the
detrimental effects of neurotoxins like MPTP and DSP-4. R-Deprenyl elicits neuroprotective and neuronal rescue activities in concentrations too low to inhibit MAO-B. It is extensively
metabolized and some of the metabolites possess pharmacological activities, thus their contribution to neuroprotective properties
was also suggested. The recently identified deprenyl-N-oxide is extensively studied in our laboratory. Effects other than neuroprotection, like influencing cell adhesion and proliferation
cannot be neglected. 相似文献
19.
O. Kaphammel N. Khalladi A. Meyer A. Schreiner C. Back R. Kap A. Jahnen N. Leners C. Als 《Médecine Nucléaire》2011,35(10):563-569
Implementations of the statutory UE requirements concerning ionizing radiation in the medical domain (96/29/Euratom, 13th May 1996; 97/43/Euratom, 30th June 1997) have changed quality control in medical imaging departments. In Luxembourg, the Ministry of Health and the “Union of Luxembourg Hospitals” have thus created a “Medical Physics Cell” (five Medical Physics experts). It is in charge of implementing a standardized program of Quality Assurance (QA) and radiation protection relative to patients as well as staffs, on a coordinated national basis, in all five in-hospital nuclear medicine departments of the country. The program distributes QA controls between three levels, various periodicities and degrees of expertise. It sensitizes staff and medical doctors by trainings and facilitates ISO accreditation. From 2002 to 2011, in all five in-hospital departments of nuclear medicine of a small country, image quality, radiation protection and reference values of each medical equipment were defined and implemented in a standard way. In 2011, the medical physics cell, the driving force leading to the institutionalization of the discipline within the nuclear medicine departments, is considered as a partner rather than as a control body by the teams in charge of the nuclear medicine departments. 相似文献
20.
The archaeologists excavate the historic site and analyze data from the excavation site. Therefore, they study about the past affairs and circumstances unknown to the world. These data are composed of stones, plants, bones and geological features, which are stored in separate files according to the fields of study. It is important to mention that this information become the first step toward the solution of some hypothesis in Archaeology. Therefore, we need the system that can not only support integrated environment to find clues of the past, but also manage existing artifact data systematically and grasp relationships among the data. In this paper, we modeled the time, which is used in archaeology and geology, and built an entity relationship database to store Paleolithic data excavated in Jungwon region site of the Republic of Korea as one resource, which seem to give a base for integrated research and relationships in archaeology. In addition, we developed the Graphic User Interface that allows various users to connect to the established system through the web. 相似文献