丝状体

Up to now, the mechanism of singnal transduction involved in heterocyst differentiation is still unclear.

Anabaena PCC7120是一种丝状蓝细菌，在培养基中缺失化合态氮源的条件下，丝状体上分化形成异形胞执行固氮的功能。

The biochemical and physiological effects of Pb~(2+) on conchocelis of Porphyra yezoensis was lower relatively, at the beginning, the algae still grew under the condition of higher concentration-40 mg/L, mannite content and POD activity appeared a tendency to first increased and then decreased, but chlorophyll a content declined slightly, on the contrary, MDA content went up quickly.

Pb~(2+)对条斑紫菜丝状体的毒性相对较弱，在浓度40 mg/L时，处理早期(12h时)丝状体仍有生长，此浓度下藻体的甘露醇含量和POD活性均随处理时间的延长呈现先升后降的趋势，而叶绿素a含量逐渐下降，与此相反，丙二醛含量迅速上升。

This paper takes conchocelis of Porphyra yezoensis as experiment material, analyzes the toxicity of heavy metal ions on 6 parameters of chlorophyll a content, soluble protein content, mannite content, peroxidase activity, malonaldehyde content and the growth of conchocelis. In experimental conditions, samples were exposed to mercuryHg~(2+, copperCu~(2+, cadmium Cd~(2+, plumbumPb~(2+ and zincZn~(2+ at different concentrations and were taken after exposure for different hours.

本文以条斑紫菜丝状体为实验材料，测定条斑紫菜丝状体中叶绿素a含量、可溶性蛋白含量、甘露醇含量、过氧化物酶活性、丙二醛含量及藻体生长情况6项生理生化指标，研究分析了不同处理浓度和不同培养时间下重金属离子Hg~(2+)、Cu~(2+)、Cd~(2+)、Pb~(2+)、Zn~(2+)对条斑紫菜丝状体的毒性效应。

SEM observation of the earliest skeletal fossils from the late Sinian Dengying Formation in southern Shaanxi, China indicates that the tube wall of Sinotubulites levis is encrusted by phosphate spherical and filamentous structure, possibly reflecting microbially mediated phosphatization of tube wall. Three preservational microfabrics detected, namely mat-like structure formed by intertwining of rigid filaments, densely packed spheres with a distinctive framboidal external surface and hollow centers and tightly packed spherical bodies with extremely smooth external surface, may refer to different types of mineralized cyanopytes.

陕南晚震旦世高家山生物群中骨骼化石的电镜扫描显示，Sinotubulites levis壳壁中具有丰富的磷酸盐化球状和丝状体，可分为3种不同类型的微生物组构：1由相互缠绕的丝状体所组成的藻席状组构；2由外表面成莓球状，内部中空的球状体紧密堆叠所形成的组构类型；3由表面极为光滑的球状体堆叠所形成的组构。

Sinense, the spores germinate inside their exospores and then divide into massive protonemata;the massive protonemata can form two kinds of protonemata of which one is clubbed protonema with papillae,and the other is caulonema composed of long and cylindrical cells ; the gametophyte archaeocytes only occur on the massive protonemata.

结果表明：中华缩叶藓的孢子在壁内萌发，随后分裂产生块状原丝体；块状原丝体上可产生两种丝状体，一种是具疣的棒状原丝体，另一种是由长圆柱状细胞组成的轴丝体；配子体原始细胞只产生于块状原丝体上。

Taking the advantage of microsatellite marker in individual identification, plan to verificate the blades of pure line on molecular level.

在海上培养的纯系丝状体后代叶状体在产量和质量上比同一海区养殖的普通种类具有优势。

The vegetative body of the filamentous algae (e.g. Spirogyra), composed of a line of similar cells joined by their end walls.

丝状体：2。丝状藻类的植物体，由一列相似的细胞彼此通过端壁连接而成。

Young thalluscells of low development are easy to dedifferentiate and grow intoseedings directly,while mature thallus cells have to releasemonospores to form seedings through a stage of multicellular groupfor dedifferentiation.Old thallus,mainly of productive cells,releasecarporspores to form conchocelis at last.

幼嫩的叶状体细胞，由于其分化程度低，易于脱分化而直接长成细胞苗；成熟的叶状体细胞，要经过多细胞团这样一个脱分化的阶段，然后放散单孢子成苗；而老叶状体以生殖细胞为主，只能放散果孢子，最终长成丝状体。

Samples of conchocelis and gametophytic baldes of both SF-1 and Y-6 (isolated from SF-1 line) lines had a unique allele on PC40 locus, indicating that it can be used as a marker to distinguish these two lines from the others.

在引物PC-40界定的遗传座位上，2个优良品系申福1号和优质6号（以申福1号为母本选育出来的品系）的丝状体和叶状体均出现了区别于其他品系的等位基因，显示对这2个优良品系进行SSR特异性标记是可能的。

Nutrient cells were obtained from these pigment mutants by enzymatic method and conchocelis were got by parthenogenesis. When the conchocelis were mature and conchospores were released, they were cultured singly and picked up as F1 gametophytic thallus.

通过酶法分离突变体的营养细胞，单性生殖获得丝状体；分别使丝状体成熟并放散壳孢子，然后单株培养和筛选获得褐黄、翠绿和褐绿色子代叶状体。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。