摘要:

SUMMARYC14tracer and fluorescein dye experiments on translocation through the stipes ofMacrocystisare reported. Both dye and C14‐labeled products move mainly in the sieve tubes acropetally and basipetally in variable amounts and at variable rates, frequently entering young developing blades en route. The maximum rate of transport of organic products of photosynthesis may reach 65‐78 cm/hr, while that of fluorescein rarely exceeds 1.0 cm/hr in intact fronds. By their behavior, fluorescein and the C1J′‐labeled products(s) resemble phloem translocation in vascular

ISSN:0022-3646    

DOI:10.1111/j.1529-8817.1965.tb04554.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SUMMARYSexual contact between the isogametes of hetero‐thallicChlamydomonasspecies is based on a highly efficient agglutination mechanism, whose complementary components–the mating‐type substances–are localized on the flagellar tips. Evidence is presented that the sex‐ and species‐specific isoagglutinins (gam‐ones) detected in the supernatant of each gamete type are those contact components, secondarily detached in active form. Added to the opposite sex these components can cause agglutination within one gamete type, apparently by the reaction of their combining sites with the complementary receptor groups. The evidence for the identity of the isoagglutinins with the surface substances effecting the normal gamete contact consists of their parallel behavior with regard to the species‐, sex‐, phase‐, and site‐specific

ISSN:0022-3646    

DOI:10.1111/j.1529-8817.1965.tb04555.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SUMMARYStaurastrum polymorphumBréb. is a desmid showing different types of symmetry within a clone. Low temperature favors the formation of the quadriradiate form; high temperature favors the formation of the triradiate form. The change from one form to the other has been observed to occur abruptly in a single division. Possible mechanisms for the effect are discussed. The work is correlated with field observations by a previous writer

ISSN:0022-3646    

DOI:10.1111/j.1529-8817.1965.tb04556.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SUMMARYSpongiochloris typica,grown in a 2‐membered culture with a soil bacterium, did not produce zoospores. The zoospore‐inhibiting effect could be found in the cell‐free filtrate of the bacterial culture grown in complete medium. The phenomenon could not be attributed to a deficiency of Ca or any other component of the medium. Zoospore inhibition could be demonstrated only when the pH was 8.4 or above. Manipulation of the components of complete medium showed that the ammonium ion was necessary for inhibition. Co‐action of any other ion in the complete medium with the ammonium ion could not be demon

ISSN:0022-3646    

DOI:10.1111/j.1529-8817.1965.tb04557.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SUMMARYAntigens of algae in the generaTetracystisandChlorococcumhave been studied extensively by immunodiffusion techniques. Some antigens were species‐, group‐, or genus‐specific; others were common to both genera. The results largely supported other data from morphology, physiology, and ultrastructure but indicated a probable error in the taxonomic placement of one species. The cross reactivity between genera may be of importance in human inhalant allergy to

ISSN:0022-3646    

DOI:10.1111/j.1529-8817.1965.tb04558.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SUMMARYGrowth of 39 axenic algal isolates from the Austin, Texas, waste‐stabilization pond system and the Colorado River, aerobically and with air excluded, in light and in darkness in a basal inorganic medium supplemented with glucose, mannose, fructose, urea, sodium acetate, casein hydrolysate, and coconut milk, could be classified in 5 categories: (1) inhibition by certain carbon compounds; (2) growth aerobically in light only; (3) growth in light only, either aerobically or with air excluded; (4) growth in light aerobically or with air excluded and in the dark aerobically; and (5) growth in light or darkness, aerobically or with air excluded. Apparently, under conditions of air exclusion or darkness, growth of certain algae can continue provided that the proper organic compounds are present to act as a carbon source and if the algae have the enzymes to metabolize them. In addition, the algae which can metabolize such organic sources are, in effect, able to carry out processes usually associated with the bacteria in sewage treatment in waste‐stabilization ponds. It is suggested that autochthonous development of algae under such conditions may be partially instrumental in “bloom” fo

ISSN:0022-3646    

DOI:10.1111/j.1529-8817.1965.tb04559.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SUMMARYMature tropical marine algae were transplanted from Jamaica, Bermuda, and Florida to aquaria at Duke University, North Carolina and The Queen's University of Belfast, Northern Ireland. Genera cultured included:Caulerpa, Halimeda, Penicillus, Udo‐tea, Acetabularia, Batophora, Cymopolia, Dictyosphaeria, Neomeris,andValonia.Methods of transport and culture are described. The use of adult plants was convenient, as well as essential for those genera and species in which spore or gamete stages are as yet unknown. Since only small amounts of seawater were needed for maintenance of the cultures, studies on these livinng marine algae can be made at institutes far from the sea.The growth of new segments and young plants ofHalimeda, Penicillus,andUdoteaare described as well as gametangial development, aging and decay inHalimeda.Sequential photographs ofPenicillusandHalimedashow development from the time the plants first appeared above the sand to relative maturity. Changes in morphology after a few months’culture are also descri

ISSN:0022-3646    

DOI:10.1111/j.1529-8817.1965.tb04560.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SUMMARYLotic species of freshwater algae have a higher respiratory rate in a current as compared with that in still water. Species in 4 classes (Chlorophyceae, Xan‐thophyceae, Bacillariophyceae, Rhodophyceae) were tested. A correspondingly higher uptake of P32was also noted. The fact that the increase in metabolic rate results from the sweeping effect of a current was indicated by the lower mineral uptake of filaments floating free in a current as compared with that of filaments held still in the current in the same container. The current effect was evident even at current speeds as low as 1‐4 cm j

ISSN:0022-3646    

DOI:10.1111/j.1529-8817.1965.tb04561.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SUMMARYTo elucidate cause and effect relationships operating within cyanophycean water blooms, preliminary laboratory and field studies were made to discern physiologically active metabolites affecting the growth of various algal species in 3 ponds of different nutritional types.Blue‐green algal blooms in Missouri ponds were composed of relatively few species.Microcystis aeruginosa,the most prevalent species, was a major constituent of most of the blooms in which it occurred.Dense cyanophycean blooms occurred only in ponds having a high organic content. Growth inhibitors apparently were produced by blue‐green algae in nature as well as in the laboratory. The results suggest that these active metabolites may be important in controlling species succession and species dominance within a given phytoplankton populat

ISSN:0022-3646    

DOI:10.1111/j.1529-8817.1965.tb04562.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY

摘要:

SUMMARYThe following marine chrysomonads, originally described by Carter, are redescribed:Pseudopedinella pyriforme, Ochromonas oblonga,andPyrmnesium parvum. Parachrysiclalisn.g. is set up forP. estuariale,with a flattened body and 2 equal flagella inserted in the middle of one side. Redescribed Xanthophy‐cean species includeNephrochloris salinaandOlis‐thocliscus luteus. Olisthodiscus carteraeandO. magnusare new species, the first distinguished by the position of the flagella and large number of chromatophores, O. magnusby its size (30‐18 μX 15‐25 μ) and anteriorly inserted but posteriorly trailing flagellum. Among Cryptophyceae, Chroomonas vectensisCarter, Rhodomonas amphioxeiaConrad, andCryptomonas salinaandC. stigmaticaWislouch are redescribed along withRhodomonas minutav.apyrenoidosavar. nov. Redescribed Chlorophyta areBipedinomonas pyriformisCarter, Pyramimonas obovataCarter, P. amyliferaConrad, and what may beTetra‐selmis suecica(Kylin) Butcher. The loricate, probably colorlessCalycomonas gracilis(Lohmann) Wulff is

ISSN:0022-3646    

DOI:10.1111/j.1529-8817.1965.tb04563.x

出版商:Blackwell Publishing Ltd    

年代:1965

数据来源: WILEY