Microbial responses using denaturing gradient gel electrophoresis to oil and chemical dispersant in enclosed ecosystems

Microbial responses to the addition of oil with or without a chemical dispersant were examined in mesocosm and microcosm experiments by using denaturing gradient gel electrophoresis of bacterial ribosomal DNA and direct cell counting. When a water-soluble fraction of oil was added to seawater, increases in cell density were observed in the first 24h, followed by a decrease in abundance and a change in bacterial species composition. After addition of an oil-dispersant mixture, increases in cell density and changes in community structure coincided, and the amount of bacteria remained high. These phenomena also occurred in response to addition of only dispersant. Our results suggest that the chemical dispersant may be used as a nutrient source by some bacterial groups and may directly or indirectly prevent the growth of other bacterial groups.     

On the Age of the Hsiwan Coal Series

The geology of the Hsiwan coal field has been studied by Dr. Yoh of theGeological Survey of Kwangtung and Kwangsi and Messrs. Meng and Chang ofthe Geological Institute of the Academia Sinica. All these authors assigned aLower Carboniferous age to the coal-bearing series. Their grounds are probably     

An Outline of the Geological Structure of the Western Hills of Peiping

As a pioneer worker in almost every phase of the Chinese geology,the late Dr. V. K. Ting was also a pioneer and enthusiastic worker inthe geology of the Western Hills. It was due to his noble effort andsupervision that the first systematic investigation of 1916 was carried out     

NOTES ON THE MICROSTRUCTURE OF SOME COALS FROM NORTH CHINA

In attempting to gain some notion as to the constitution of different types of coal of North China and their correlation, I have adopted at this initial stage two methods: One is the process of microscopic examination by     

COMPLETE LIST OF MEMBERS OF THE GEOLOGICAL SOCIETY OF CHINA. (SEPTEMBER 1926)

Important notice to members:- All members are earnestly requested to send to the Secretary of the Society any change of address. The     

UPPER CAMBRIAN FOSSILS FROM FENGTIEN.

INTRODUCTION. The upper Cambrian of Fengtien was studied by Dr. Andersson whomade the following section and kindly permitted me to use it. (Fig. 1) Theupper Cambrian rest disconformably upon the pre-Cambrian rocks, which areof Sinian age. Upwards it is succeeded probably with a disconformity bythe Ordovician.     

UPPER CAMBRIAN OF KAIPING BASIN.

The Cambrian of China is developed in Yunnan, Shantung, Chihliand Manchuria. The first collection of Cambrian fossils was made by VonRichthofen and described by Dames and Kayser. Dames studied thetrilobites and Kayser described the brachiopods.     

THE DEVEIOPMENT OF GEOGRAPHY IN CHINA DURING LAST TWENTY YEARS

(1) Cartography (2) Geophysics (3) Physiography (4) Climatology (5) Hydrography (6) Oceanography     

AREAS OF 3338 ISIANDS ALONG THE COAST OF CHINA

1 All islands are measured by Plauimeter.2 Maps and charts used: a, British Admiralty Charts b, Charts published by the Hydrographic Department of Chinese Navy, c, Japanese Charts