589 research outputs found
(Page 290) Composition of a manganese deposit sample from the Todoroki Mine, Japan
No full textThe Todoroki Mine is situated about 25 kilometers to the south-east of Ginzan railway station in Siribesi Province, Hokkaido. The author analysed an interesting specimen of black manganese-ore which had a fractured surface which looked like that of a broken piece of wood. This new manganese mineral was studied in its form, physical properties and chemical composition. The author later named this mineral form as "todorokite"
Description of manganese deposits from the Todoroki mine, Hokkaido area, Japan
No full textManganese deposits are abundant in various places in the Oshima Peninsula southwest of Hokkaido. This is particular the case of Todoroki Mine situated about 25 kilometers to the south-east of the Ginzan railway station in Siribesi Province. It consists of manganese beds intermixed with a tertiary volcanic tuff complex overlaying granite
Mineralogical aspects of interstratified chlorite-smectite associated with epithermal ore veins: A case study of the Todoroki Au-Ag ore deposit, Japan
No full textChlorite (C)-corrensite (Co)-smectite (S) seriesminerals occur as vein constituents in the two epithermal ore veins, the Chuetsu and Shuetsu veins of the Todoroki Au-Ag deposit. The characteristics of the C-Co-S seriesminerals indicate that the clays may be products of direct precipitation from hydrothermal fluids and subsequent mineralogical transformations during and/or after vein formation. The minerals from the Chuetsu vein are characterized by 'monomineralic' corrensite showing an extensive distribution throughout the vein, and trioctahedral smectite occurring locally. The Shuetsu vein minerals are characterized by C-Co series minerals which can be divided into three different types: a I type including discrete chlorite with minor amounts of S layers, a II type comprising interstratified C/Co and discrete chlorite, and a III type characterized by segregation structures of C and Co layers. The C-Co series minerals show slightly different spatial distributions in the Shuetsu vein. Different epithermal environments during the vein formations and possible kinetic effects may have played a role in the formation and conversion of Co-C series at the Shuetsu vein and S-Co series at the Chuetsu vein
Pancreatic carcinoma: correlation between E-cadherin and alpha-catenin expression status and liver metastasis
No full textBACKGROUND:Dysfunction of the E-cadherin/catenin-mediated cell-cell adhesion system has been associated with invasiveness and poor differentiation of human carcinomas. However, its importance in the genesis of liver metastasis has not been examined sufficiently.METHODS:A series of 26 primary pancreatic carcinomas and the concomitant liver metastases from 15 of them, obtained at autopsy, were analyzed for E-cadherin and alpha-catenin protein expression by immunohistochemistry.RESULTS:Both E-cadherin and alpha-catenin expression were preserved in 15 (58%) and reduced in 11 (32%) of the 26 primary pancreatic carcinomas. In the former 15 primaries, carcinoma cells were attached to each other tightly, whereas the latter 11 primaries showed isolated or loosely connected attachments. The metastatic ratio was higher in tumors exhibiting tight adhesion than in those with loose adhesion: 73% and 36%, respectively (P = 0.059). E-cadherin and alpha-catenin expression patterns in liver metastases basically followed those in the corresponding primaries (P < 0.01).CONCLUSIONS:Reduced E-cadherin and alpha-catenin expression in primary pancreatic carcinoma has no significant predictive value regarding the presence of liver metastasis. Rather, there is a greater tendency for liver metastasis in cases in which the integrity of the E-cadherin/catenin-mediated cell-cell adhesion system is intact
Observation of the 1154.9 nm transition of antiprotonic helium
No full textThe resonance transition of the antiprotonic helium (He) isotope at a wavelength of 1154.9 nm was detected by laser spectroscopy. The population of He occupying the resonance parent state was found to decay at a rate of s, which agreed with the theoretical radiative rate of this state. This implied that very few long-lived He are formed in the higher-lying states with principal quantum number , in agreement with the results of previous experiments
In-flight antiproton annihilation on nuclei at low energies
No full textThe results of the annihilation cross sections measurement of 5.3 MeV antiprotons on nickel, tin, platinum and Mylar targets performed by the ASACUSA Collaboration at CERN are presented and compared with the existing data and models. From the experimental point of view the presented data are the first measurement of antinucleon annihilation cross sections at low energies obtained with a pulsed beam. This results open the road for the next measurements at the very low energies of the order of 100 keV that are in progress by the ASACUSA Collaboration. The experimental method foreseen for the 100 keV measurement is illustrated
The coral δ15N record of terrestrial nitrate loading varies with river catchment land use
No full textWe analysed the nitrogen isotopes in two coral cores (δ15Ncoral) from the mouth of the Todoroki River, Ishigaki Island, Japan, to examine whether the δ15Ncoral reflects the run-off of nitrate related to the land use in the river catchment. The two coral cores were used to examine the seasonal variation in δ15Ncoral for 14 years (CORE1; 1993–2007) and the annual variation of δ15Ncoral for 52 years (CORE2; 1958–2010). In CORE1, the 5-month running mean of δ15Ncoral was positively correlated with that of monthly precipitation, excluding all strong precipitation events (>150 mm d−1). In CORE2, the δ15Ncoral mean in the earlier period (1958–1980) was 1.0 ‰ greater than that in the later period (1981–2010). The annual averages of δ15Ncoral are positively correlated with the total precipitation in the rainy season (May–June) for both time periods. The difference in the δ15Ncoral between the earlier and later periods is probably caused by the land use changed from paddy fields with 15N-rich manure to sugar cane fields in the early 1980s. Although some uncertainties still remain regarding the precision of δ15N coral proxy records, this study emphasises the clear potential for their use in reconstructing terrestrial nitrate discharge records from corals
Conflicts of Secular Lords in Light of a Historical Document from 11th-Century Poitou : Amicable Settlements, War, Vassalage, and Bodies
No full textStudies of conflicts and their resolution in medieval European society have proliferated recently. One can, however, point out that these studies display two problems. One concerns documentation : prior studies have focused almost exclusively upon monastic documents, which have led them to stress the importance of amicable settlements or compromises in feudal disputes. The other is a theoretical one : those studies have viewed the judicial system only in terms of its function in eliminating disputes or military confrontations and restoring social order. The author believes that this presupposition is in need of re-evaluation. For this reason, this paper analyzes a rare historical document from early eleventh-century Poitou, a region in Western France. The document closely depicts conflicts between secular lords from a worldly perspective. This document, entitled "le conventum, " is something of an apology whose writer attempts to support and justify the claims of one of the antagonists, Hugh of Lusignan, against other secular lords, and above all, William V, Duke of Aquitaine. The paper also argues that those compromises concluded in the course of conflicts between the secular lords are closely connected to factors considered outside the sphere of justice, such as warfare or feudal contracts. Firstly, the conflicts observed between castellans in this region were never free from intervention from their superior, Duke William. Importantly, his intervention was far from the neutral mediation stressed by previous researchers who relied on monastic documents. William is depicted, for example, requesting that Hugh cancel a pact of amicable settlement that he had concluded with another castellan and instead sign another which was more politically favorable to the duke himself. At first glance, some pacts or conventions concluded between secular lords, including the Duke of Aquitaine, seem to be compromises between them. Actually, in most cases, they are at the same time designed to advance preparations for war against some other lord. Those compromises also included contracts of vassalage, thereby playing a determining role in regulating the relationships between secular lords. It can be said, therefore, that the relations of power in this society were largely determined by its conflictual structure. Secondly, the conventions concluded during the process of the conflicts often prescribed the handing over of hostages as security from one party to the other or to the Duke of Aquitaine. Those deals can be considered as representing a linkage between settlements, act of the legal system of justice in its broadest sense, and warfare, action outside the system, because prisoners of war were sometimes used as hostages in compromises, or because hostages were handed over in preparation for war in place of fiefs. Thirdly, the last scenes of "le conventum, " in which Hugh of Lusignan declares the breaking of his vow of fealty to Duke William, which leads to open warfare between them and finally to the signing of another pact for an amicable settlement, are interesting in that we can see that unwritten rules govern the prosecution of war and proceedings of the court. In conclusion, the relations of power between secular lords in early eleventh century Poitou seem to have been based upon a permanent state of conflict. This dose not mean that this society had fallen into a state of anarchy. Instead, the pacts and conventions concluded in the process of resolving conflicts helped to create, or recreate, vassal relations at times and justified war at others, thereby determining how secular lords dealt with each other in this society
Near-infrared laser spectroscopy of antiprotonic helium atoms
No full textThe ASACUSA (Atomic Spectroscopy and Collisions Using Slow Antiprotons) collaboration is currently attempting to observe a laser-induced resonant transition of antiprotonic helium atoms at wavelength of 1154.9 nm. Motivations to observe this transition and a nanosecond near-infrared laser prepared for this work are presented
Comparison of Smectite–Corrensite–Chlorite Series Minerals in the Todoroki and Hishikari Au–Ag Deposits : Applicability of Mineralogical Properties as Exploration Index for Epithermal Systems
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