实验探究与学生创新能力的培养

学生对生活中的一些化学现象提出置疑,利用自己已有的实验能力和认知能力,运用实验手段,印证结论或探究未知。使学生真正成为化学实验的主体和中心,使学生实现自主、体验、参与和合作的学习方式并达到掌握知识和培养创新能力的目的。     

Worked Human Femur from Gohar Tepe,Iran

A simple tool made from a gracile human femoral shaft was retrieved from a small animal bone assemblage found in a Late Bronze Age stratum at Gohar Tepe, Iran. The specimen has been identified as a chisel or gouge for which no analogous examples are known in the Near East. Studies examining similar tools from other regions suggest that such a tool may have been used for wood processing or pottery smoothing. Copyright © 2012 John Wiley & Sons, Ltd.     

Medullary Bone in Goose Remains: A Reliable Indicator of Domestic Individual in Non‐Breeding Regions

The ideal indicator of domestic individuals is the presence of traits that must appear in the first generation of the domestic lineage. Most wild geese are migratory, breeding in the subarctic zone and wintering in the temperate zone. If goose remains from archaeological sites in a non‐breeding region are from individuals shown to have died during the breeding season, the bones are likely to be from domestic birds. Medullary bone is secondary woven bony tissue formed in the marrow cavity of breeding female birds. It develops 1 or 2 weeks before the first egg is produced and disappears 1 or 2 weeks after egg production. As wild geese remain in their breeding regions for about 3 months after egg production, medullary bone would be expected to disappear before birds arrive at the stopover and wintering areas. Therefore, the presence of medullary bone in goose remains found in non‐breeding regions would be a reliable indicator of domestic birds. In this study, we examined goose (Anserini spp.) remains from 15 archaeological sites in Japan (3400 bc to 1912 ad ) using binocular observation and histological analysis. We found medullary bone in two femora from the Oranda–shokan–ato site (1650–1850 ad ). The results indicate that the two femora were from domestic geese. By using secondary bone as an indicator of the domesticity of geese, knowledge regarding the origins of domestic geese can be expanded, and the morphological and/or genetic changes, as well as the domestication process, can be revealed. According to the literature, domestic geese were kept in Japan from the early eight century ad and were popular after the 17th century ad . The scarcity of medullary bone in the samples can be explained by the small number of domestic geese in Japan and/or by butchering practices that excluded the eating of breeding female geese. Copyright © 2013 John Wiley & Sons, Ltd.     

Examining histology to identify burned bone

Early research suggests that examination of the microscopic internal structure is a valid method for distinguishing burned from unburned bone in the archaeological record. This study compares burned and unburned modern bones with archaeological bones from Sibudu Cave (ca. 60,000 years ago) and Cave of Hearths (over 200,000 years ago) to more fully describe the heat-induced histological changes to bone. We also explore the effects of diagenesis on those changes to determine if histological evidence of burning preserves through fossilisation and diagenetic processes and can be successfully used to identify ancient burning. Application of this technique can help in addressing various issues, including the origins of controlled use of fire and understanding animal butchery and disposal.     

古栉拾零

我国古代的栉,既是一种重要的首服饰物,又是一种必备的梳理用具。作为人类精神创造和物质创造的结晶,栉以其独特的方式,不仅记录了社会生活状态的变化,同时也记录了人们审美理念的变化,在人类文化发展史上占有相当重要的地位。可是,由于人们对栉的使用习以为常,乃至于忽视了它们的存在价值。本文运用对比分析的方法,辨识出"不为人识"、"不明全貌"、"不辨其形"的三例古栉,并通过对相关遗存的分析,指出了这些古栉不仅在标识使用者身份方面具有重要的作用,而且在反映不同地区、不同人群的精神面貌方面同样具有不可忽视的作用。     

Taphonomy and Paleoichnology of Olduvai Hominid 1 (OH1), Tanzania

This paper presents a case study of the Late Pleistocene skeletal remains of Olduvai Hominid 1, which were unearthed in Tanzania. Excavated in 1913, this fossil shows severe damage due to subterranean termites (Insecta: Isoptera). By combining methods to quantify and locate traces on the skeleton with the study of the different taphonomic processes that altered the deposit, we demonstrate a non‐arbitrary pattern of termite alteration of the skeletal remains. These results shed new light on the possibility to reconstruct the original position of a skeleton in a deposit and the potential to infer the space of decomposition and past funerary practices. Copyright © 2017 John Wiley & Sons, Ltd.     

Exploring post‐excavation degradation potential of fungal communities associated with archaeological human remains

Fungal communities associated with three osteoarchaeological samples from distinct archaeological sites (T?rian, Turda?, Feleacu) in Transylvania, Romania, characterized by similar environmental conditions (wet soils), different historical age and amount of time spent in storage, were examined in order to register site‐ versus storage‐specific species. Physical anthropological taphonomic scoring was correlated with Fourier transform infrared spectroscopy (FTIR) indices in order to characterize mineral and organic bone fraction fluctuations relative to historical age. Molecular‐based species/genera identifications and scanning electron microscopy (SEM) investigations were carried out for the confirmation of dominant taxonomic items.     

Is X-ray diffraction able to distinguish between animal and human bones?

The possibility of determining the human or animal origin of bones from the lattice parameters of their inorganic bioapatite phase, when subjected to a high temperature treatment using the powder X-ray diffraction (XRD) technique, has been explored on a wide number of specimens. Forty-two animal bones were treated in a furnace at 1100 °C for 36 min and compared to 53 cremated human bones from a range of ancient necropolises. The X-ray diffraction patterns of bioapatite were simulated using both monoclinic P21/b and hexagonal P63/m structures to verify any occurrence of phase transformation and any difference in the lattice parameters due to the model. It was determined that the differences between the a-axis and c-axis of the monoclinic and hexagonal lattice were unimportant. Some outlying values were revealed to be caused by the presence of chlorine ions diffused into the apatite structure increasing its average unit cell values. Nevertheless, our results clearly show that in terms of lattice parameters the variability of human specimens are completely overlapped by the non-human variability making the use of XRD in order to distinguish animal from human bones questionable.