Surface treatment of Neolithic vessels from Macedonia and Thrace

2001 ◽  
Vol 96 ◽  
pp. 1-25 ◽  
Author(s):  
Paraskevi Yiouni
Keyword(s):  
Surface Treatment ◽  
Microscopic Examination ◽  
Petrographic Analysis ◽  
Northern Greece ◽  
Large Sample ◽  
Firing Techniques ◽  
Materials Used ◽  
First Time

This article examines the methods of surface treatment of the Neolithic vessels from northern Greece. The work is based on the study of a large sample of ceramics, covering the whole span of the Neolithic, from Macedonia and Thrace. Macroscopic study of the material was complemented by microscopic examination (SEM and petrographic analysis) and retiring tests. The results are compared with data from other technological analyses of Neolithic vessels from northern Greece. Apart from identifying, in some cases for the first time, methods of surface treatment and materials used by the potters of these regions, the present study considers the changes in surface treatment and firing techniques through time.

New surface treatment techniques to minimize copper alloy leaching in drinking water

2012 ◽  
Vol 7 (4) ◽  
Author(s):  
Norikazu Sugaya
Keyword(s):  
Surface Treatment ◽  
Raw Materials ◽  
Organic Film ◽  
Forming Process ◽  
Mixed Acid ◽  
Treatment Techniques ◽  
Acid Washing ◽  
Washing Process ◽  
Film Forming ◽  
Materials Used

This new surface treatment is simple and easy as well as low in cost. The processes can even be performed by hand. Pharmaceutical raw materials used for the surface treatment, such as hydrochloric acid and nitric acid used in a mixed acid washing process and vegetable oil used in an organic film forming process, are easily obtained in many countries.

Ultrastructural studies of Chlamydia psittaci 6BC variant strains. I. Ultrastructure of the surface layers of egg-passaged 6BC strain

1973 ◽  
Vol 19 (8) ◽  
pp. 887-894
Author(s):  
Linda Poffenroth ◽  
J. W. Costerton ◽  
Nonna Kordová ◽  
John C. Wilt
Keyword(s):  
Chick Embryo ◽  
Microscopic Examination ◽  
Electron Microscopic Examination ◽  
Chlamydia Psittaci ◽  
Gram Negative Bacteria ◽  
Surface Layers ◽  
Electron Microscopic ◽  
Gram Negative ◽  
Ultrastructural Studies ◽  
First Time

Electron microscopic examination of a semipurified Chlamydia psittaci 6BC strain attenuated in chick embryo yolk sac revealed for the first time two morphologically distinct small elementary bodies which differ both in the ultrastructure of their surface layers and in their buoyant densities in sucrose gradients. Also, the morphology of the surface layers of the larger reticulate forms in cell-free systems is described for the first time. Many points of difference between the surface envelopes and internal structure of chlamydial particles and those of Gram-negative bacteria are discussed.

scholarly journals Mineralogy and Geochemistry of Ultramafic Rocks from Rachoni Magnesite Mine, Gerakini (Chalkidiki, Northern Greece)

Minerals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 934
Author(s):  
Evangelos Tzamos ◽  
Micol Bussolesi ◽  
Giovanni Grieco ◽  
Pietro Marescotti ◽  
Laura Crispini ◽  
...  
Keyword(s):  
Raw Materials ◽  
Mining Area ◽  
Ultramafic Rocks ◽  
Northern Greece ◽  
Icp Ms ◽  
Time In Literature ◽  
History Of ◽  
First Time ◽  
The Eu

The importance of magnesite for the EU economy and industry is very high, making the understanding of their genesis for the exploration for new deposits a priority for the raw materials scientific community. In this direction, the study of the magnesite-hosting ultramafic rocks can be proved very useful. For the present study, ultramafic rock samples were collected from the magnesite ore-hosting ophiolite of the Gerakini mining area (Chalkidiki, Greece) to investigate the consecutive alteration events of the rocks which led to the metallogenesis of the significant magnesite ores of the area. All samples were subjected to a series of analytical methods for the determination of their mineralogical and geochemical characteristics: optical microscopy, XRD, SEM, EMPA, ICP–MS/OES and CIPW normalization. The results of these analyses revealed that the ultramafic rocks of the area have not only all been subjected to serpentinization, but these rocks have also undergone carbonation, silification and clay alteration. The latter events are attributed to the circulation of CO2-rich fluids responsible for the formation of the magnesite ores and locally, the further alteration of the serpentinites into listvenites. The current mineralogy of these rocks was found to be linked to one or more alteration event that took place, thus a significant contribution to the metallo- and petrogenetic history of the Gerakini ophiolite has been made. Furthermore, for the first time in literature, Fe inclusions in olivines from Greece were reported.

scholarly journals Revealing the constituents of Egypt’s oldest beer using infrared and mass spectrometry

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Mohamed A. Farag ◽  
Moamen M. Elmassry ◽  
Masahiro Baba ◽  
Renée Friedman
Keyword(s):  
Large Scale ◽  
Beer Brewing ◽  
Chemical Signatures ◽  
Chemical Determination ◽  
Materials Used ◽  
High Level ◽  
Beer Production ◽  
First Time ◽  
Detailed Chemical

Abstract Previous studies have shown that the Ancient Egyptians used malted wheat and barley as the main ingredients in beer brewing, but the chemical determination of the exact recipe is still lacking. To investigate the constituents of ancient beer, we conducted a detailed IR and GC-MS based metabolite analyses targeting volatile and non-volatile metabolites on the residues recovered from the interior of vats in what is currently the world’s oldest (c. 3600 BCE) installation for large-scale beer production located at the major pre-pharaonic political center at Hierakonpolis, Egypt. In addition to distinguishing the chemical signatures of various flavoring agents, such as dates, a significant result of our analysis is the finding, for the first time, of phosphoric acid in high level probably used as a preservative much like in modern beverages. This suggests that the early brewers had acquired the knowledge needed to efficiently produce and preserve large quantities of beer. This study provides the most detailed chemical profile of an ancient beer using modern spectrometric techniques and providing evidence for the likely starting materials used in beer brewing.

Bronze Age Cremation Cemeteries in the East Midlands

1987 ◽  
Vol 53 (1) ◽  
pp. 187-221 ◽  
Author(s):  
Carol S. M. Allen ◽  
Mary Harman ◽  
Hazel Wheeler
Keyword(s):  
Bronze Age ◽  
Direct Relationship ◽  
Small Cluster ◽  
Linear Arrangement ◽  
Thin Sections ◽  
Probable Function ◽  
East Midlands ◽  
Materials Used ◽  
First Time ◽  
Organic Remains

Two Bronze Age cremation cemeteries excavated between 1968 and 1975 are reported and discussed. At Coneygre Farm, Notts., fifty-one cremations were excavated, thirty-one in pots, six in cists, and fourteen uncontained. Cremations were deposited in a roughly linear arrangement and no barrow was found. At Pasture Lodge Farm, Lincs., twenty-seven pots were found, of which twenty-five had associated cremations, and fifteen further sherds could represent burials. Vessels in this cemetery form a small cluster. Pottery from these two cemeteries is broadly similar to Deverel-Rimbury ware and with vessels from other sites in the region is considered to form an East Midlands group of Bronze Age pottery. Vessels of this type from Frieston and Grantham, Lincs., are illustrated for the first time. Examination of thin sections of the pottery from the two cemeteries suggests that most, although not all, of the materials used could have been found locally. Organic remains found in thin sections provide environmental information. The effect of soils on durability of pots and their probable function is discussed. A direct relationship is noticed for the first time between the age of the cremated individual and the capacity of the pot in which the cremation was deposited.

Possible Causes in Breaking of Dental Implants Research

2017 ◽  
Vol 907 ◽  
pp. 104-118
Author(s):  
Maria Stoicănescu ◽  
Eliza Buzamet ◽  
Dragos Vladimir Budei ◽  
Valentin Craciun ◽  
Roxana Budei ◽  
...  
Keyword(s):  
Dental Implants ◽  
Dental Implant ◽  
Scientific Literature ◽  
Surface Characteristics ◽  
Raw Material ◽  
New Materials ◽  
Materials Used ◽  
Type Of Failure ◽  
First Time ◽  
Consequent Increase

Dental implants are becoming increasingly used in current dental practice. This increased demand has motivated manufacturers to develop varieties of product through design, but also looking for new materials used to improve surface characteristics in order to obtain a better osseointegration. But the increase in the use of implants goes to a consequent increase in the number of failures. These failures are caused either by treatment complications (peri-implantitis), by fatigue breakage under mechanical over-stress, by defective raw material, or due to errors during the insertion procedures. Although they are rare, these complications are serious in dentistry. Before to market a dental implant to clinical practitioners, the product is validated among other determinations in number of biocompatibility research. Raw material issues, details about its structure and properties are less published by the scientific literature, but all this are subject of a carefully analysis of the producers. Breaking of dental implants during surgical procedures, during the prosthetic procedures or during use (chewing, bruxism, accidents, etc.), is the second most common cause of loss of an implant after consecutive peri-implantitis rejection. Although the frequency of this type of failure for a dental implant is much smaller than those caused by the peri-implantitis, a detailed study of broken implants can explain possible causes. The use of scanning electron microscopy (SEM) in the study of the cleave areas explain the production mechanism of cleavages, starting from micro-fissures in the alloy used for the production of dental implants. These micro-fissures in weak areas of the implant (anti-rotational corners of the polygons, etc.) could generate a serious risk of cleavage first time when a higher force is applied.

scholarly journals ON THE STUDY OF THE MANUFACTURING TECHNIQUES DEALS WITH THE CERAMICS OF THE MAIKOP- NOVOSVOBODNAYA COMMUNITY BY THE METHOD OF. A. A. BOBRINSKY AND NEW EXPERIMENTS

2015 ◽  
Vol 4 (4) ◽  
pp. 59-71
Author(s):  
Sergey Nikolaevich Korenevskiy ◽  
Andrey Sergeevich Kizilov
Keyword(s):  
Surface Treatment ◽  
Raw Materials ◽  
Flat Bottom ◽  
Axis Of Rotation ◽  
Fixed Axis ◽  
Manufacturing Techniques ◽  
First Time

The article presents a brief synthesis of the results deal with the study of ceramics Maikop-novosvobodnaya community using the method of a. a. Bobrinsky and use of the microscope with 12 times magnification. it sets out ideas about raw materials, methods of construction, surface treatment. especially emphasized the problem of the use by the ancient potters of rotary devices. For the first time about such vessels were noted in the work of a. a. Bobrinsky and r. M. Munchaev in 1966, for example, vessels with a flat bottom. at present a series of examples of traces deal with use of rotary devices has expanded. in the article by a. s. Kizilov shows the simulation of the vessel of the Maikop culture and fixation of the traces of its turn without a fixed axis of rotation and with a non-fixed environment of rotation. as a result, the actual doing of those and other traces that prove the use of Maikop potters rotary devices with a fixed axis of rotation in the manufacture of vessels not only flat, but round bottom too.

scholarly journals Giant radio galaxies in the LOFAR Two-metre Sky Survey

2020 ◽  
Vol 635 ◽  
pp. A5 ◽  
Author(s):  
P. Dabhade ◽  
H. J. A. Röttgering ◽  
J. Bagchi ◽  
T. W. Shimwell ◽  
M. J. Hardcastle ◽  
...  
Keyword(s):  
Spectral Index ◽  
Radio Galaxy ◽  
Radio Galaxies ◽  
Large Sample ◽  
Search Techniques ◽  
Sky Survey ◽  
Data Release ◽  
Cluster Environment ◽  
First Time

Giant radio galaxies (GRGs) are a subclass of radio galaxies, which have grown to megaparsec scales. GRGs are much rarer than normal-sized radio galaxies (< 0.7 Mpc) and the reason for their gigantic sizes is still debated. Here, we report on the biggest sample of GRGs identified to date. These objects were found in the LOFAR Two-metre Sky Survey first data release images, which cover a 424 deg2 region. Of the 239 GRGs found, 225 are new discoveries. The GRGs in our sample have sizes ranging from 0.7 Mpc to 3.5 Mpc and have redshifts (z) between 0.1 and 2.3. Seven GRGs have sizes above 2 Mpc and one has a size of ∼3.5 Mpc. The sample contains 40 GRGs hosted by spectroscopically confirmed quasars. Here, we present the search techniques employed and the resulting catalogue of the newly discovered large sample of GRGs along with their radio properties. In this paper, we also show for the first time that the spectral index of GRGs is similar to that of normal-sized radio galaxies, indicating that most of the GRG population is not dead or is not similar to a remnant-type radio galaxy. We find that 20 out of 239 GRGs in our sample are located at the centres of clusters and we present our analysis on their cluster environment and radio morphology.

scholarly journals Evidence for Primordial Abundance Variations in the Globular Cluster 47 Tuc

1995 ◽  
Vol 164 ◽  
pp. 396-396
Author(s):  
B.F.W. Croke ◽  
R.A. Stathakis ◽  
R.D. Cannon ◽  
J.E. Hesser ◽  
R.A. Bell
Keyword(s):  
Spectral Resolution ◽  
Globular Cluster ◽  
Large Sample ◽  
Object System ◽  
Primordial Abundance ◽  
First Time

The FOCAP multi-object system on the Anglo-Australian Telescope (AAT) has been used to observe 35 faint stars (V > 18, Mv > + 4.6) and 83 stars with V < 18 in 47 Tuc. The large sample of stars well below the turnoff permits us to examine abundance variations in relatively unevolved stars for the first time. Our spectral resolution (2.7Å) is greater than that used in previous studies.

scholarly journals Prevalence of Sarcosporidiosis in Carcasses of Cattle Slaughtered at the Eucalyptus Slaughterhouse-Algeria

2020 ◽  
Vol 77 (2) ◽  
pp. 54
Author(s):  
Messaouda TAIBI ◽  
Amel BENATALLAH ◽  
Safia ZENIA ◽  
Miriem AISSI ◽  
Khaled HARHOURA ◽  
...  
Keyword(s):  
Risk Factors ◽  
Microscopic Examination ◽  
Enzymatic Digestion ◽  
Parasitic Disease ◽  
Intestinal Infection ◽  
Sarcocystis Spp ◽  
Sarcocystis Hirsuta ◽  
Domestic Carnivores ◽  
First Time ◽  
Macroscopic Examination

Sarcosporidiosis is a parasitic disease due to the development of cystogenic coccidia of the genus Sarcocystis with dixene evolution and muscular localization, which can cause losses in cattle and generate an intestinal infection in domestic carnivores (dog, cat) and humans. The objective of our study was to determine the prevalence of Sarcocystis spp on 149 bovine carcasses at the Eucalyptus slaughterhouse in Algiers by macroscopic and microscopic examination and to evaluate the influence of certain risk factors (age, sex, breed and origin). Samples of esophagus and diaphragms were taken from slaughtered cattle and analyzed by enzymatic (pepsin) digestion and histological technique. The macroscopic examination was negative during carcasses inspection while the microscopic examination showed a prevalence of 100% for enzymatic digestion by revealing bradyzoites in the form of bananas and 47.7% at the histology with the detection of thin-walled cysts of S. cruzi (98.6%), of thick-walled cysts of S. hominis (15.5%) which was the zoonotic species and of S. hirsuta (1.39%). The risk factors studied significantly influenced the prevalence of Sarcocystis sp. This study revealed for the first time in the diaphragm a cyst of Sarcocystis hirsuta.

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