The Royal Society
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Late quaternary history of vegetation and climate of the Rajasthan desert, India
The Royal Society - Tập 267 Số 889 - Trang 467-501 - 1974
The results from stratigraphy, radiocarbon dating and pollen analysis of three
salt-lake deposits at Sambhar, Lunkaransar and Didwana in western Raj'asthan,
and one freshwater lake deposit at Pushkar in the Aravalli Hills, are described
in conjunction with pollen analysis of some archaeological soil samples from the
Indus Valley site at Kalibangan in northern Rajasthan. The salt-lake deposits
stud...
Specific impairments of planning
The Royal Society - Tập 298 Số 1089 - Trang 199-209 - 1982
An information-processing model is outlined that predicts that performance on
non-routine tasks can be impaired independently of performance on routine tasks.
The model is related to views on frontal lobe functions, particularly those of
Luria. Two methods of obtaining more rigorous tests of the model are discussed.
One makes use of ideas from artificial intelligence to derive a task heavily
loade...
Cytopathogenicity of Entamoeba histolytica
The Royal Society - Tập 307 Số 1131 - Trang 73-85 - 1984
The lesions induced in man by Entamoeba histolytica are characterized by massive
tissue injury in the absence of major local signs of a host immune response. The
amoeba damages surrounding cells preferentially by contact-mediated cytolysis.
Recently, a presumptive aetiological factor underlying this process has been
identified. It is a protein, amoebapore, capable of spontaneous incorporation
into...
Unstalked crinoids of the antarctic continental shelf, notes on their natural history and distribution
The Royal Society - Tập 246 Số 734 - Trang 327-379 - 1963
An account is given of the natural history, distribution and relative abundance
of the comatulids of the Antarctic continental shelf. On the whole they form a
distinctive geographical assemblage, that, cut off from northern influence, has
evidently evolved in isolation since at least from the beginning of the
Pleistocene or Quaternary Period. Where large enough numbers have been
encountered the di...
Diet and teeth: Dietary hypotheses and human evolution
The Royal Society - Tập 292 Số 1057 - Trang 57-64 - 1981
Hypotheses concerning the diet of early hominids have played an important role
in discussions on human evolution. Three investigations have helped define the
extent to which dietary hypotheses may be taken and still be testable.
Comparative anatomy is a fairly coarse approach, which despite convergences
allows only the most specialized diets to be ruled out. A biomechanical analysis
makes it clear...
Late Quaternary vegetational history of the Enga province of Upland Papua New Guinea
The Royal Society - Tập 286 Số 1012 - Trang 265-344 - 1979
Stratigraphies and pollen analyses are reported from three sites within 25 km
east and west from Wabag in the highlands of Papua New Guinea, namely: Sirunki,
2500 m above sea level, 32000 to 1500 yr Inferred Ages; Inim, 2500 m above sea
level, 10000 to 0 yr Inferred Ages; Birip, 1900 m above sea level, 2300 to 0 yr
Inferred Ages. Events evidenced by these data are described against a time scale
of...
Central processes in speech understanding
The Royal Society - Tập 295 Số 1077 - Trang 317-332 - 1981
Considering the psychological mechanisms of language as functioning
psycholinguistic processes, the fundamental question - from the perspective of
speech comprehension - is how these processes operate over time to transform a
transient sensory input into a meaningful utterance. The research reported here
suggests that these processes are organized to allow optimally effective use of
the informatio...
An anomaly in the response of the eye to light of short wavelengths
The Royal Society - Tập 278 Số 960 - Trang 207-240 - 1977
Adaptation of the human eye to long-wavelength light leaves it insensitive to
short-wavelengths: a blue flash that is visible in the presence of a yellow
adapting field may remain invisible for several seconds after the field has been
turned off (see experiment 1 and Appendix). This ‘transient tritanopia’ occurs
for a large range of adapting intensities, but is abolished if the adapting
field is v...
Mang cá: cơ chế chuyển vận muối trong nước ngọt và nước biển Dịch bởi AI
The Royal Society - Tập 262 Số 842 - Trang 209-249 - 1971
Mang của cá có cấu trúc đa dụng, chuyên biệt cho việc trao đổi khí hô hấp, loại
bỏ sản phẩm thải của quá trình chuyển hóa nitơ và duy trì cân bằng axit-bazơ và
khoáng chất. Các nghiên cứu cấu trúc đã tiết lộ một biểu mô phức tạp. Các "tế
bào clo" gần như chắc chắn là vị trí trao đổi ion liên quan đến cân bằng muối.
Các nghiên cứu chức năng cho thấy mang chịu trách nhiệm cho sự hấp thụ ròng của
Na ...
The structure of β-lactamases
The Royal Society - Tập 289 Số 1036 - Trang 321-331 - 1980
The β-lactamases are widely distributed in both Gram-positive and Gram-negative
bacteria. They all inactivate penicillins and cephalosporins by opening the
β-lactam ring. Many varieties of the enzyme can be distinguished on the basis of
their catalytic and molecular properties, but only amino acid sequence
determination gives information upon which a molecular phylogeny can be based.
The present e...
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