利用振动活塞取样管研究近岸沉积层的方法

形成各种堆积体——砂滩、砂嘴、砂洲等的近岸沉积层结构的研究在海岸研究中占有特殊地位。在沉积层结构中,以及它的岩石学和动物区系方面反映着沉积层发展的历史。对于堆积体结构的研究,可以使我们追溯它发展时期的层序性,从而指出在特定的地理条件下的海岸演化的一般规律性。通过厚度的研究、层次相关性的对比、使用现代方法测定沉积层的绝对增长,我们就     

On the Occurrence of Sublepidodendron,a Lepidodenroid Plant from the Wutung Formation

正 The recent finding of plant-remains in the Hsiashan series adds an important chapter to the Carboniferous stratigraphy in the province of Kiangsi. This formation is certainly very widely distributed in the central and southern parts of the province, and has been hitherto considered to be Devonian     

On the Occurrence of Gigantopteris-Flora in Kwangsi

The geological and geographical distribution of the genus Gigantopteriswas first summarized by Yabe in 1917. Fourteen years later Yoh published alist of 20 localities distributed in different provinces in China known at that timenamely Hunan, Shansi, Liaoning, Kiangsi, Fukien, Chekiang, Anhui, Yunnan     

ber ein Vorkommen von Ullmannia aus dem Perm in Kwangsi

Die Seltenheit oder Abwesenheit der Conifer-Reste in dem Perm von Ostasienist nach wie vor bemerkenswert. In dem so reichhaltigen Material der ShihhotzcSerie in Shansi, ist noch keine Spur (Vgl. Halle 1927, S. 263, 264, 267) oder nurunsicherer Rest (Sze 1935, S. 575) davon gefunden worden. Erst in 1933 hatte ichin P. L. Yuan's Sammlung von Sinkiang einige schlecht erhaltene Conifer-Zweige     

ber einige mesozoische Flora von Hsiwan(Kwangsi)

Seit der Publikation der Arbeit von Dr.S.S.Yoh(1933 a.a.0.)wurdendie Kohlenf(o|¨)hrenden Schichten in Hsiwan~1 im allgemeinen als Unter-karbon oder Kulm angeh(o|¨)rig betrachtet.So hat auch der Verfasser vor     

V.K.Ting,Scientist and Patriot.

In the lamented death of Dr. V. K. Ting on January 5th, 1936, at the age of49, China suffered an irredeemable loss. He may be called the founder of thescience of geology in China, and it was in geological field work that his con-     

THE SEARCH FOR EARLY MAN IN CHINA

The first indication of the existence of early man in North Chinawas announced by Prof. Max Schlosser of Munich, Germany, who in hiswork "Die fossilen Saugethiere Chinas" in 1903 briefly described a posteriormolar tooth of Homo? or Anthropoid? gen. et sp. undetermined. The possibilityof its being Tertiary was suggested. The material was bought in Peking.     

The relative importance of water and diet for uptake and subcellular distribution of cadmium in the deposit-feeding polychaete, Capitella sp. I

The impact of dietary and water exposure on the accumulation and distribution of cadmium (Cd) in subcellular components of the polychaete Capitella sp. I was investigated. Worms were exposed to either dissolved Cd alone ('Water-Only' treatments; WO) or diet-bound Cd alone ('Algae-bound Only' treatments; AO). Thus, WO worms were starved and AO worms were fed. Differential centrifugation was used to fractionate worm homogenates into debris- (DE), mitochondrial- (MI), microsomal- (MC) and cytosolic- (CY) fractions, and the concentration of Cd in these fractions was quantified by radiometric analysis using the specific activity of the (109)Cd radioisotope. Neither exposure route nor Cd exposure affected the total protein content in the worms. However, fed, but not starved worms relocated proteins from the mitochondria to the cytosol in response to Cd exposure. In systems without Cd addition, starvation likewise influenced the distribution of protein between mitochondria and cytosol. Cutaneous uptake and accumulation of Cd from the water was related to surface area while dietary uptake was influenced by the amount of sediment passing through the gut. Irrespective of exposure route, Cd was accumulated primarily in the debris fraction although comparisons between the treatments indicated that relatively less Cd was located in DE and more in MI, MC and CY fractions in worms in AO compared to worms in WO. Cd per unit protein in DE and MI fractions was twice as high as in MC and CY fractions in WO, whereas MC contained the highest Cd content followed by MI, DE and CY fractions in AO worms. Our results stress the importance of exposure route for the internal distribution and toxicity of Cd to deposit feeders such as Capitella sp. I.