Synedra ulna var. repanda, a new variety of Synedra （Bacillariophyta） from Xinjiang, China

Synedra ulna var. repanda Q. X. Wang & Q. M. You, a new variety of Synedra (Bacillariophyta) from Xinjiang, China, is described and illustrated, and the characteristic of the variety: includes undulate-linear valves and straight pseudoraphe, differs from other species of Synedra.     

郑州市南北郊气温对比分析

对近45a气象资料分析结果表明：郑州市南郊和北郊气温变化趋势基本一致，年平均气温、季平均气温、平均最高气温、平均最低气温均呈现出不同程度的上升趋势。南北郊气温在20世纪50年代差异不大，随着郑州市的不断扩大，北郊进一步城市化，两地气温差异逐渐加大，北郊年平均气温，平均最高、最低气温和季节平均气温均高于南郊，80年代以后，差距更为明显。     

广西季气温、降水量异常频次的时空分布特征

根据世界气象组织二倍标准差和降水量距平百分率±60%标准,统计分析了广西88站1960年以来春季(2~4月)、前汛期(4~6月)、夏季(6~8月)、秋季(9~12月)和冬季(12~2月)的平均气温和降水量表明,近二十多年来,异常气候增加了,从季节看,冬季,不仅是发生异常高温和异常低温最多的季节,也是发生异常多雨和异常少雨最多的季节,更是异常气候空间分布范围最大的季节。     

郑州市南北郊气温对比分析

对近45 a气象资料分析结果表明:郑州市南郊和北郊气温变化趋势基本一致,年平均气温、季平均气温、平均最高气温、平均最低气温均呈现出不同程度的上升趋势。南北郊气温在20世纪50年代差异不大,随着郑州市的不断扩大,北郊进一步城市化,两地气温差异逐渐加大,北郊年平均气温,平均最高、最低气温和季节平均气温均高于南郊,80年代以后,差距更为明显。     

小麦品种对禾谷缢管蚜抗性的多目标评价及抗性因素分析

用多目标层次加权法评价了 8个小麦品种对禾谷缢管蚜的综合抗性 ,结果表明 ,8个小麦品种的抗蚜性强弱依次为 W6 (4 0 ) 2、小偃六号、NWAU34- 9、陕 16 7、陕 80 0 7、85(6 7) 2 4、81(2 8) 2 8、85(6 7) 15。抗性因素的分析表明 ,品种感蚜值与游离氨基酸总量呈负相关 ,在 17种游离氨基酸中 ,感蚜值与赖按酸和精氨酸的含量显著负相关 ,而与总糖含量呈正相关     

环保型泥浆助剂的生产与应用

对纤维素类、淀粉类、丹宁类改性产品的性能作一简单介绍     

延津沙地葡萄园品种换优与苗木综合扩繁技术

采用硬枝嫁接、绿枝嫁接、绿枝压条、硬枝扦插技术实现了沙地劣质葡萄园的换优建园和优质苗木的快速繁育。     

The appearance of Ulva laetevirens (Ulvophyceae,Chlorophyta) in the northeast coast of the United States of America

Introduced species may outcompete or hybridize with native species, resulting in the loss of native biodiversity or even alteration of ecosystem processes. In this study, we reported an alien distromatic Ulva species, which was found in an embayment (Holly Pond) connected with Long Island Sound, USA. The morphological and anatomical observations in combination with molecular data were used for its identification to species. Anatomy of collected specimens showed that the cell shape in rhizoidal and basal regions was round and the marginal teeth along the basal and median region were not found. These characteristics were primarily identical to the diagnostic characteristics of Ulva laetevirens Areschoug (Chlorophyta). The plastid-encoding tufA and nucleusencoding ITS1 were used for its molecular identification. Phylogenetic analysis for the tufA gene placed the specimens from Holly Pond in a well-supported clade along with published sequences of U. laetevirens identified early without any sequence divergence. In ITS tree, the sample also formed well-supported clades with the sequences of U. laetevirens with an estimated sequence divergence among the taxa in these clades as low as 1%. These findings confirmed the morpho-anatomical conclusion. Native to Australia, this species was reported in several countries along the Mediterranean coast after the late of 1990s. This is the first time that U. laetevirens is found in the northeast coast of United States and the second record for Atlantic North America.     

华南地区钦杭成矿带地质特征和矿床时空分布规律

钦杭成矿带位于华南板内,尽管是扬子与华夏古陆在新元古代拼接部位,但绝大多数矿床形成于中晚侏罗世至白垩纪.本文在梳理前人工作成果的基础上,将钦杭带及旁侧矿床归纳为两个成矿系列和三个成矿亚系列,即:新元古代海底喷流沉积型铜锌矿床成矿系列和燕山期与花岗岩有关的钨锡铜铅锌多金属矿床成矿系列,后者可以进一步分为中晚侏罗世斑岩-矽...     

玛纳斯碧玉的宝石学研究

采用薄片观察、电子探针、红外光谱等测试手段,对玛纳斯碧玉的各品种进行了矿物学、宝石学、谱学特征和化学成分的研究。结果显示,玛纳斯碧玉的主要矿物组成为透闪石-阳起石,其中翠绿色点状物"翠花"是由于早期阳起石而形成。玛纳斯碧玉的物质组成特征显示其为超基性岩蚀变而成。