4,408 Result(s)
-
Article
Enzymatic synthesis of deshexapeptide insulin
The semisynthesis of deshexapeptide insulin (DHI) from desoctapeptide insulin (DOI) reported earlier1 showed that DHI was biologically active. However, the product was not quite homogeneous, mainly due to the est...
-
Article
The **gaze ophiolite (Tibet): a peculiar oceanic lithosphere
The **gaze ophiolite which outcrops along the Yarlung Zangbo river, southern Tibet, locally displays a complete ophiolitic sequence from marine sedimentary cover over basaltic volcanics to the north, to fresh ...
-
Article
The Tibetan side of the India–Eurasia collision
Results are reported from the 1980 joint French–Chinese field expedition in Tibet. The area covered was from the High Himalaya in the south, to the region of Nagqu ∼250 km north of Yangbajain. Ophiolites in th...
-
Article
Intensity of the geomagnetic field near Loyang, China between 500 BC and AD 1900
There are remarkably few data on the intensity of the geomagnetic field in early China. New results reported here indicate that the total intensity of the magnetic field of the Earth in the region near Loyang ...
-
Article
Structure and evolution of the Himalaya–Tibet orogenic belt
The 1981 French–Chinese expedition to Tibet focused on the Lhasa block, extending earlier coverage 400 km north of the Tsangpo suture. The Lhasa block stood between 10 and 15° N latitude over most of the Upper...
-
Article
Strategy by which nitrogen-fixing unicellular cyanobacteria grow photoautotrophically
Among nitrogen-fixing microorganisms, nitrogen-fixing cyanobacteria are unique in their ability to carry out oxygen-evolving photosynthesis and oxygen-labile nitrogen fixation within the same organisms1–3. These ...
-
Chapter
Seismicity Simulation with a Rate- and State-Dependent Friction Law
The dynamic motions and stabilities of a single-degree-of-freedom elastic system controlled by different friction laws are compared. The system consists of a sliding block connected to an elastic spring, drive...
-
Chapter
Effect of Slip Rate on Stress Drop
Recent observations made by Kanamori and Allen about earthquake recurrence time and average stress drop revealed a very interesting relation: earthquakes with longer recurrence times have higher average stress...
-
Chapter
2000 Jahre alte Karten und kartographische Regeln
Eine chinesische Legende erzählt von neun bronzenen Kesseln, die zur Zeit der **a-Dynastie (ca. 21.–16. Jh. v. Chr.) gegossen wurden und die Kartendarstellungen der verschiedenen Regionen des Landes mit Gebirg...
-
Chapter
Phänologische Kalender und Erkenntnisse
Phänologie ist die Lehre der jahreszeitlich und klimatologisch bedingten Erscheinungsformen von Pflanzen und Tieren. Da sich die chinesische Landwirtschaft schon vor ca. 6000–7000 Jahren zu entwickeln begann u...
-
Article
Independent binding of the retinoblastoma protein and p107 to the transcription factor E2F
THE cellular protein p107 and the retinoblastoma protein (pRB) have many features in common. Most strikingly, they contain homologous protein domains that mediate interaction with the oncoproteins of several s...
-
Chapter
Cellular Effects of Extremely Low Frequency (ELF) Electromagnetic Fields
Epidemiological studies have revealed a possible association of cancer risk (predominently leukemia and brain center) with environmental and occupational exposure to low intensity, extremely low frequency (ELF...
-
Article
Rodent polyphyly?
-
Article
. . . and attacked
-
Article
Flexible light-emitting diodes made from soluble conducting polymers
THE recent fabrication of light-emitting diodes (LEDs) from conjugated polymers1,2demonstrates the technological potential of this class of electronic materials. A variety of colours are possible, because the wav...
-
Article
Elevated blood pressure and craniofaclal abnormalities in mice deficient in endothelin-1
The endothelin-1 (ET-1) gene was disrupted in mouse embryonic stem cells by homologous recombination to generate mice deficient in ET-1. These ET-1-/- homozygous mice die of respiratory failure at birth and have ...
-
Article
A matrix metalloproteinase expressed on the surface of invasive tumour cells
GELATINASE A (type-IV collagenase; Mr 72,000) is produced by tumour stroma cells and is believed to be crucial for their invasion and metastasis, acting by degrading extracellular matrix macro-molecules such as t...
-
Article
Partial activation of CD8+ T cells by a self-derived peptide
T CELLS are normally activated when the peptide for which they are specific is presented to them in the context of the appropriate major histocompatibility complex (MHC) (class I and Class II for CD8+ and CD4+ T ...
-
Article
Scavenger receptor-mediated adhesion of microglia to β-amyloid fibrils
A PATHOLOGICALhallmark of Alzheimer's disease is the senile plaque, containing β-amyloid fibrils, microglia and astrocytes1. β-amyloid fibrils exert a cytotoxic effect on neurons2, and stimulate microglia to pro...
-
Article
HIV-1 subtype and second-receptor use