九龙江口红树林研究Ⅳ.秋茄群落的氮、磷的累积和循环

本文是福建九龙江口红树林生态系统研究的一个部分,主要讨论20年生秋茄群落的氮、磷含量及其生物循环。试验结果表明:秋茄群落现存量中,含有氮、磷总量分别为935.47和112.02公斤/公顷。其中地上部分别为582.26和70.47公斤/公顷;地下部分别为353.21和41.55公斤/公顷。该群落氮、磷元素生物循环中,年吸收量分别为213.31和21.75公斤/公顷;存留量分别为83.75和10.91公斤/公顷;归还量分别为129.52和10.84公斤/公顷。它们的氮含量均大于磷含量,周转期氮需7年比磷需10年为快。     

九龙江口红树林研究IV.秋茄群落的氮、磷的累积和循环

本文是福建九龙江口红树林生态系统研究的一个部分,主要讨论20年生秋茄群落的氮、磷含量及其生物循环。试验结果表明：秋茄群落现存量中,含有氮、磷总量分别为935.47和112.02公斤／公顷。其中地上部分别为582.26和70.47公斤／公顷,地下部分别为353.21和41.55公斤／公顷。该群落氮、磷元素生物循环中,年吸收量分别为213.31和21.75公斤／公顷;存留量分别为83.75和10.91公斤／公顷;归还量分别为129.52和10.84公斤／公顷。它们的氮含量均大于磷含量,周转期氮需7年比磷需10年为快。     

九龙江口红树林研究Ⅱ.秋茄群落的钾、钠累积和循环

本文是福建九龙江口红树林生态系统研究的一个部分,主要讨论20年生秋茄群落的钾、钠的含量及其生物循环。试验结果表明:秋茄群落现存量中,含有钾、钠总量分别为531.97和2100.36公斤/公顷;其中地上部分分别为296.49和742.91公斤/公顷;地下部分分别为235.48和1357.45公斤/公顷。该群落钾、钠生物循环中年吸收量分別为109.15和353.50公斤/公顷·年,归还量分别为59.37和160.18公斤/公顷·年。存留量为49.78和193.32公斤/公顷·年。它的钠含量比钾含量大,周转期钾需9年比钠需13年为快。     

九龙江口红树林研究Ⅴ.秋茄群落的氯的累积和循环

本文是福建省九龙江口红树林研究的一部分,主要讨论20年生秋茄(Kandelia candel)群落氯元素的累积及其生物循环。试验结果表明,秋茄群落现存量中含有氯总量3864.13公斤/公顷:其中地上部为1287.75公斤/公顷,地下部为2576.38公斤/公顷。该群落氯元素生物循环中年吸收最为626.57公斤/公顷,归还量为271.31公斤/公顷,存留量为355.26公斤/公顷,周转期需14年。     

九龙江口红树林研究V.秋茄群落的氯的累积和循环

本文是福建省九龙江口红树林研究的一部分,主要讨论20年生秋茄(Kandelia candel) 群落氯元素的累积及其生物循环。试验结果表明,秋茄群落现存量中含有氯总量3864.13公斤／公顷：其中地上部为1287.75公斤／公顷,地下部为2576.38公斤／公顷。该群落氯元素生物循环中年吸收量为626.57公斤／公顷,归还量为271.31公斤／公顷,存留量为355.26公斤／公顷,周转期需14年。     

红海榄红树林的氮、磷积累和生物循环

本文讨论广西山口英罗湾中红海榄群落的氮、磷含量及其生物循环。结果表明,红海榄群落现存量中,含氮、磷总量分别为221.15和13.27g/m~2。其中地上部分别为134.90和8.73g/m~2;地下部分别为86.25和4.54g/m~2。该群落的氮、磷元素生物循环中,年吸收量分别为12.91和1.27g/m~2,年存留量分别为7.04和0.65g/m~2;年归还量分别为5.86和0.61g/m~2。富集率分别为1.11和1.60。群落各组分的氮含量均大干磷含量;周转期氮需38a,比磷(22a)慢。     

海南岛海莲红树林的钾钠元素的累积和循环

本文是海南东寨港红树林研究的一部分,主要讨沦55年生海莲林的K、Na元素的累积和生物循环。试验结果表明：在海莲群落现存量中,含有K、Na总量分别为669.9和2951.3kg／ha;其中地上部分别为425.6和908.9kg／ha,地下部分别为244.3和2042.4kg／ha。该群落的k、Na元素的生物循环中,年吸收量分别为89.6和204.4kg／ha,归还量为49.0和99.8kg／ha,存留量为40.6和104.6kg／ha。K的周转期为14年比Na30年为快。     

深圳福田红树林无瓣海桑+海桑群落N、P、K累积和循环

研究了深圳福田红树林无瓣海桑 +海桑群落的 N、P、K元素的累积和循环。结果表明 ,该群落 N、P、K元素的现存累积量分别为 :3 8694.92、 5 848.62、 5 0 861 .47mg/m2 ,其中地下部分分别占 2 8.5 9%、41 .77%、 42 .0 8%。该群落氮、磷、钾元素生物循环中 ,年吸收量分别为 :1 3 2 40 .0 95、 1 887.70 5、 2 0 73 6.1 1mg/m2 ;年归还量分别为 :62 70 .5 85、 979.1 75、 63 5 3 .948mg/m2 ;年存留量分别为 :6969.5 1、 90 8.5 3、 1 43 82 .1 62 mg/m2 ;周转期分别为 :7a、6a、9a。群落各组分的氮含量最高 ,磷含量最低。     

海南岛海莲红树林的钙镁累积和循环

本文是海南东寨港红树林研究的一部分,主要讨论55年生海莲林的Ca、Mg元素的累积和生物循环。试验结果表明,在海莲群落现存量中,含有Ca、Mg总量分别为3258.1和597.9kg·ha~(-1),其中地上部分别为1891.9和247.1kg·ha~(-1),地下部分别为1366.2和350.8kg·ha~(-1)。该群落的Ca、Mg元素的生物循环中,年吸收量分别为382.0和100.4kg·ha~(-1),存留量131.3和20kg·ha~(-1),归还量为250.7和80.4kg·ha~(-1)。Ca的周转期为13年,较Mg8年为慢。     

哀牢山北部木果石栎林的元素积累及循环

根据对哀牢山北部徐家坝地区木果石栎林化学元素的吸收、分布及其生物循环的研究结果表明,碳素在树干中含量最高,而其它元素的含量均以叶片最高,枝和根其次,树干最低。该森林群落中碳、氮、磷、钾、钙、镁、锰、钠、铝和铁元素的积累量达２６０３４６ｋｇ／ｈｍ＾２,其中乔木层的元素积累量占该群落元素总积累量的９８．５％,灌木层和草本层的元素积累量仅分别占１．３％和０．２％。在该群落中各元素的积累量以碳＞钙＞氮＞钾     

Recent advances in the study of Kaposi's sarcoma-associated herpesvirus replication and pathogenesis

It has now been over twenty years since a novel herpesviral genome was identified in Kaposi's sarcoma biopsies. Since then, the cumulative research effort by molecular biologists, virologists, clinicians, and epidemiologists alike has led to the extensive characterization of this tumor virus, Kaposi's sarcoma-associated herpesvirus(KSHV; also known as human herpesvirus 8(HHV-8)), and its associated diseases. Here we review the current knowledge of KSHV biology and pathogenesis, with a particular emphasis on new and exciting advances in the field of epigenetics. We also discuss the development and practicality of various cell culture and animal model systems to study KSHV replication and pathogenesis.     

The structure, reproduction and taxonomy of Vidalia and Osmundaria (Rhodophyta, Rhodomelaceae)

Comprises species occurring mostly in subtidal habitats in tropical, subtropical and warm-temperate areas of the world. An analysis of the type species, V. spiralis (Sonder) Lamouroux ex J. Agardh, a species from Australia, establishes basic characters for distinguishing species in the genus. These characters are (1) branching patterns of thalli, (2) flat blades that may be spiralled on their axis, (3) width of the blade, (4) primary or secondary derivation of sterile and fertile branchlets and (5) position of sterile and fertile branchlets on the thalli. Application of the latter two characters provides an important basic method for separation of species into three major groups. Osmundaria , a genus known only in southern Australia, was studied in relation to Vidalia , and its separation from the Vidalia assemblage is not accepted. Species of Vidalia therefore are transferred to the older genus name, Osmundaria. Two new species, Osmundaria papenfussii and Osmundaria oliveae are described from Natal. Confusion in the usage of the epithet, Vidalia fimbriala Brown ex Turner has been clarified, and Vidalia gregaria Falkenberg, described as an epiphyte on Osmundaria pro/ifera Lamouroux, is revealed to be young branches of the host, Osmundaria prolifera.     

New or rare chromosome counts in Artemisia L. (Asteraceae, Anthemideae) and related genera from Kazakhstan

Fifteen chromosome counts of six Artemisia taxa and one species of each of the genera Brachanthemum, Hippolytia, Kaschgaria, Lepidolopsis and Turaniphytum are reported from Kazakhstan. Three of them are new reports, two are not consistent with previous counts and the remainder are confirmations of very scarce (one to four) earlier records. All the populations studied have the same basic chromosome number, x = 9, with ploidy levels ranging from 2x to 6x. Some correlations between ploidy level, morphological characters and distribution are noted.     

肝癌中HBV和HCV基因和抗原的分布及意义

采用原位分子杂交方法检测HCV RNA及HBV X基因;采用免疫组织化学方法研究HCV核心抗原,非结构区C33c抗原及HBxAg在肝细胞肝癌中的定位及分布.结果表明(1)HCV RNA、HBV X基因在肝细胞肝癌组织检出率分别为40%(55/136)和82%(112/136).HCV RNA定位于癌细胞的胞浆内,阳性细胞呈散在、灶状及弥漫分布三种形式;HBV X基因在肝癌细胞中的分布呈胞浆型、核型及核浆型,阳性细胞也呈上述三种分布形式;(2)HCV C33c抗原、核心抗原在肝细胞肝癌中的阳性率为81%(133/164)及86%(141/164).C33c抗原定位于癌细胞及肝细胞的胞浆内;核心抗原既定位于癌细胞核中,又可定位于胞浆中.C33c抗原阳性细胞以灶状分布为主;而核心抗原阳性细     

Selection with two alleles and complete dominance

For a plant selection model with frequency-independent viabilities, fertilities and selfing rates, it is shown that apart from global fixation, for certain parameter combinations a protected polymorphism and facultative fixation (either allele may become fixed according to initial frequencies) may both occur. Facultative fixation requires different selling rates for the dominant and recessive type. Protection of the polymorphism requires resource allocation for male and female function. In this connection the problem of purely genetically caused population extinction is discussed.
For general frequency dependence and regular segregation, the chances for establishment of a completely recessive gene are compared to those of a completely dominant gene. It is proven that the process of establishment of the recessive gene, despite a fitness advantage, may be considerably endangered by drift effects if random mating prevails. The recessive gene may reach the same effectivity in establishment as a dominant gene, only if the recessive homozygote mates exclusively with its own type during the period of establishment.