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1.
Microsensor measurements of CO 2, O 2, pH and Ca 2+ in the vicinity of the symbiont-bearing planktonic foraminifer Orbulina universa showed major light-modulated changes in the chemical microenvironment due to symbiont photosynthesis, respiration of the holobiont, and precipitation of the calcite shell. Under saturating light conditions, microprofiles measured towards the shell surface showed an O 2 increase of up to 220% air saturation, a decrease in CO 2 concentration to 4.9 μM, and a pH increase to 8.8 due to symbiont photosynthesis. The Ca 2+ concentration decreased to ∼9.6 mM in two specimens, while it increased to 10.2-10.8 mM in three other specimens kept in light. In darkness, the respiration of the community decreased the O 2 concentration to 82% of air saturation, CO 2 increased up to 15 μM, the pH decreased to 8.0, and the Ca 2+ concentration increased up to 10.4 mM. These data, and derived calculations of the distribution of HCO 3- and CO 32- near the shell, showed that the carbonate system in the vicinity of O. universa was significantly different from conditions in the surrounding seawater, both in light and darkness, due to the metabolism of the foraminifer and its associated algae. Experimental light-dark cycles indicated a sufficient CO 2 supply sustaining high carbon fixation rates of the symbiotic algae via conversion of HCO 3- or via CO 2 release from calcification and host respiration. Our findings on irradiance-dependent CO 2 and pH changes in the vicinity of symbiont-bearing planktonic foraminifera give direct experimental evidence for the predictions of isotope fractionation models used in palaeoclimatology stating that metabolic processes affect the isotopic carbon signal (δ 13C) in foraminifera. 相似文献
2.
为了探讨光照强度和CO 2浓度对蛋白核小球藻( Chlorella pyrenoidosa)生长、无机碳利用的复合效应, 丰富绿藻中无机碳浓缩机制的资料, 该文设置两种光照强度(40和120 µmol photons•m -2•s -1)和两种CO 2浓度(0.04%和0.16%)组合成4种条件, 比较了蛋白核小球藻生长、无机碳浓度、pH补偿点、光合放氧速率、碳酸酐酶(CA)活性和α-CA基因转录表达对这4种培养条件的响应。结果发现: 蛋白核小球藻在高光强高CO 2浓度组生长最快; 低光强高CO 2浓度组培养体系中总无机碳浓度为1163.3 µmol•L -1, 显著高于其他3组; 高光强低CO 2浓度组藻的pH补偿点最高(9.8), 而低光强高CO 2浓度组藻的pH补偿点最低(8.6); 低光强高CO 2浓度组藻的最大光合速率( Vmax)和最大光合速率一半时的无机碳浓度( K0.5)最高, 分别是其他3组的1.28-1.91倍和1.61-2.00倍; 高光强低CO 2浓度组藻的胞外CA活性最高; 而低光强低CO 2浓度组藻的胞外α-CA基因表达量显著高于其他3组。以上结果表明低CO 2浓度可促进蛋白核小球藻的pH补偿点和无机碳亲和力的提高, 诱导胞外CA活性及α-CA基因的表达; 该藻主要以HCO 3-为无机碳源, 其对无机碳的利用受光照的调节。 相似文献
3.
利用开顶式熏气室研究了不同土壤水分条件下不同CO 2浓度对禾谷缢管蚜种群的影响,以期对未来大气CO 2浓度升高条件下不同降雨地区的小麦蚜虫关系发展趋势做出初步预测.结果表明,随CO 2浓度升高,禾谷缢管蚜种群持续增长,但以CO 2浓度从350μl·L -1上升到550μl·L -1时增长最快;禾谷缢管蚜种群大小与土壤水分密切相关,各CO 2浓度下均以60%土壤水分的最大;当CO 2浓度从350μl·L -1上升到550μl·L -1时,60%土壤水分下的种群增长最快;当CO 2浓度从550μl·L -1上升到700μl·L -1时,60%和40%土壤水分下的种群增长相近,且高于80%土壤水分下的增长.据此可以认为,随大气CO 2浓度升高,禾谷缢管蚜种群会持续增长,从目前至下世纪中叶的时间内可能是蚜虫种群增长最快的阶段,特别在干旱、半干旱地区禾谷缢管蚜种群增长幅度较大、小麦受害较重. 相似文献
4.
金针菇栽培通过提高栽培室CO 2浓度来抑制菌盖生长,提高商品质量。碳酸酐酶能调节CO 2/HCO 3 -在细胞内的平衡,它可能是响应CO 2胁迫的关键酶。本研究利用我们已完成的金针菇 Flammulina filiformis的基因组测序数据,以双色蜡蘑碳酸酐酶家族基因为参照,通过本地BLAST,得到7个金针菇碳酸酐酶家族的基因,分别命名为 CA-1、 CA-2、 CA-3、 CA-4、 CA-5、 CA-6、 CA-7。基因结构、保守结构域和系统进化分析结果均支持这7个序列是碳酸酐酶家族的编码基因。高浓度CO 2胁迫处理金针菇子实体12h, CA-1、 CA-2表达量与CO 2浓度正相关, CA-5负相关, CA-3、 CA-4和 CA-6没有响应, CA-7无明显规律。据此推测, CA-1、 CA-2和 CA-5可能是金针菇响应CO 2胁迫的关键基因之一,参与调控菌盖生长发育。 相似文献
5.
近年来, 由于对湿地的不合理利用, 自然湿地被大面积地垦殖为农田, 导致湿地生态系统碳循环的模式发生改变, 从而影响了湿地生态系统碳汇功能。该研究通过涡度相关法, 对山东省东营市黄河三角洲芦苇( Phragmites australis)湿地和开垦多年的棉花( Gossypium spp.)农田的净生态系统CO 2交换( NEE)进行了对比观测, 以探讨该地区典型生态系统 NEE的变化规律及其影响因子, 揭示开垦对芦苇湿地 NEE和碳汇功能的影响。结果表明: 在生长季, 湿地和农田生态系统 NEE的日平均值各月均呈明显的“U”型变化曲线, 非生长季 NEE的变幅很小。生长季湿地生态系统日最大净吸收值和释放值分别为16.04 g CO 2·m -2·d -1(8月17日)和14.95 g CO 2·m -2·d -1(8月9日); 农田生态系统日最大净吸收值和释放值分别为18.99 g CO 2·m -2·d -1 (8月22日)和12.23 g CO 2·m -2·d -1 (7月29日)。生长季白天两个生态系统 NEE与光合有效辐射( PAR)之间呈直角双曲线关系; 非生长季 NEE主要受土壤温度( Ts)的影响; 生态系统生长季夜间 NEE受 Ts和土壤含水量( SWC)的共同影响; 湿地和农田的生态系统呼吸熵( Q10)分别为2.30和3.78。2011年生长季, 黄河三角洲湿地和农田生态系统均表现为CO 2的汇, 总净固碳量分别为780.95和647.35 g CO 2·m -2, 开垦降低了湿地的碳吸收能力; 而在2011年非生长季, 黄河三角洲湿地和农田生态系统均表现为CO 2的源, CO 2总释放量分别为181.90和111.55 g CO 2·m -2。全年湿地和农田生态系统总净固碳量分别为599.05和535.80 g CO 2·m -2。 相似文献
6.
This study was designed to evaluate the effect of interference and exploitation competition in shell partitioning between two hermit crab species ( Pagurus criniticornis and Clibanarius antillensis). Field samples revealed that shells of the gastropod Cerithium atratum were the main resource used by both hermit crab species and that Pagurus used eroded or damaged shells in higher frequency than Clibanarius. The exploitative ability of each species was compared between species in the laboratory using dead gastropod ( Cerithium) baits to simulate predation events and signalize newly available shells to hermit crabs. Pagurus reached the baits more rapidly than Clibanarius, but this higher exploitative ability did not explain shell utilization patterns in nature. Another experiment evaluated the dominance hierarchy between these two hermit crab species and revealed that Clibanarius was able to outcompete Pagurus for higher quality shells in agonistic encounters. This higher interference competitive ability of Clibanarius in relation to Pagurus may explain field observations. Nevertheless, Pagurus may be responsible to enhance shell availability to other hermit crab species that have lower ability to find and use newly available shells. Differently, the poorer condition of shells used by Pagurus, the higher ability of this species to attend gastropod predation events and its higher consumption rate by shell-breaking crabs ( Menippe nodifrons) may increase its predation risks, thus revealing the disadvantages of such an exploitative competitive strategy for hermit crabs. 相似文献
7.
组成长白山阔叶红松林的主要树种红松、云杉、落叶松、大青杨、白桦、椴树、水曲柳和色木的幼树,盆栽于模拟自然光照和人工调节CO 2浓度为700μl·L -1、400μl·L -1的气室内两个生长季,以生长在400μl·L -1下的幼树为对照组,在各自生长条件下测定,高CO 2浓度下生长的红松、云杉、落叶松、大青杨、白桦、椴树、水曲柳和色木的高生长比对照组的幼树提高10%~40%.高CO 2浓度的幼树与对照CO 2下的幼树相比各树种蒸腾速率升降不一,但水分利用效率均有不同程度的提高,不同树种的可溶性糖和叶绿素含量对高CO 2浓度反应不一,反映出幼树对高CO 2浓度适应的复杂性.长期高CO 2浓度环境下生长的阔叶树对CO 2变化反应较针叶树敏感,供试树种均发生光合驯化现象. 相似文献
8.
本试验建立了4组中型实验生态系统,即空白对照系统、许氏平鮋单养系统、栉孔扇贝单养系统和许氏平鮋-栉孔扇贝混养系统,利用静态箱-气相色谱法对各养殖系统水-气界面CO2通量进行观测,并测定养殖水体物理、化学和生物指标.结果表明:试验期间,空白对照系统表现为稳定的对大气CO2的源,平均通量为12.42 mg·m^-2·h^-1.扇贝单养系统在试验前期和中期为CO2的源,后期为CO2的汇,试验期间整体为CO2的源,平均通量为10.95 mg·m^-2·h^-1.许氏平鮋单养系统和许氏平鮋-栉孔扇贝混养系统在试验前期表现为CO2源,实验中后期为CO2的汇,试验期间平均通量分别为-3.53和-10.49 mg·m^-2·h^-1,整体上均为对大气CO2的汇.回归分析结果显示,水体pH是水-气界面CO2通量较好的预测因子,pH=8.25是系统水-气界面碳源/汇功能发生转变的临界值.线性混合模型分析结果显示,水体净初级生产力是影响各系统水-气界面CO2通量的主要因子,表明浮游植物是调控系统水-气界面CO2通量的主要生物内动力.在本试验混养密度条件下的栉孔扇贝能一定程度上促进浮游植物生物量和水体初级生产力,从而增强系统水-气界面CO2的碳汇功能. 相似文献
9.
探讨大气CO 2浓度和水分变化对3种典型绿肥植物光合性能及水分利用效率的影响,可为未来气候变化情形下草地生态系统适应性管理提供理论支持。本试验利用可精准控制CO 2浓度的人工气候室,设置400(自然大气)和800 μmol·mol -1(倍增)两个CO 2浓度,80%土壤田间持水量(FC)(充分灌水对照)、55%~60%FC(轻度水分亏缺)、35%~40%FC(中度水分亏缺)、<35%FC(重度水分亏缺)4个水分梯度,研究CO 2浓度增加和水分亏缺对甘蓝型油菜、白三叶和紫花苜蓿叶绿素含量、气体交换参数及水分利用效率(WUE)的影响。结果表明: 同一CO 2浓度下,与充分灌水对照相比,当土壤水分<40%FC时,3种植物的叶绿素含量和气体交换参数均显著降低;土壤水分为55%~60%FC时,3种植物的叶绿素总含量无显著变化,而白三叶和紫花苜蓿的光合速率( Pn)、蒸腾速率( Tr)降低了6%~25%,但WUE无显著性差异。与大气CO 2浓度相比,CO 2浓度倍增使充分灌水处理下甘蓝型油菜的 Pn显著降低了21.5%,而显著增加了轻度水分亏缺下3种植物的 Pn,且增加了中度水分亏缺下甘蓝型油菜和紫花苜蓿的 Pn,但只对重度水分亏缺下紫花苜蓿的 Pn有所改善;CO 2浓度倍增显著增加了白三叶和紫花苜蓿在所有水分处理下的WUE,但只增加了甘蓝型油菜在轻度水分亏缺下的WUE。CO 2浓度和水分的交互作用对3种植物的 Pn均有显著影响,但仅对甘蓝型油菜的WUE有显著影响。综上,3种植物对大气CO 2浓度倍增和水分亏缺的响应存在明显差异,CO 2浓度升高能改善轻度水分亏缺对3种植物光合性能和WUE的不利影响,但只改善了重度水分亏缺下紫花苜蓿的光合性能。 相似文献
10.
叶片最大羧化速率是表征植物光合能力的关键参数, 受到光照、温度、水分、CO 2浓度、叶片氮含量等多个要素的控制。准确地模拟植物叶片最大羧化速率对环境因子的响应是预测未来植被生产力和碳循环过程的前提。目前大多数陆地碳循环过程模型以Farqhuar光合作用模型为基础模拟植物的光合作用, 关于植物叶片的最大羧化速率与叶氮含量关系的模拟方法却各不相同。该文汇总了1990-2013年国内外植物叶片光合速率观测研究文献中叶片最大羧化速率与叶氮含量的关系式及相关数据, 分析了叶片最大羧化速率与叶氮含量关系随不同植被功能型和时间的变化特征, 以及环境因子变化条件下最大羧化速率与叶氮含量关系的变化特征, 探讨了二者关系变异性的可能原因以及影响因子。结果表明: 1)不同功能型植物叶片的最大羧化速率和叶氮含量的关系存在较大差异, 二者线性关系式的斜率平均值变化范围为16.29-50.25 μmol CO 2·g N -1·s -1。落叶植被叶片的最大羧化速率随叶氮含量的变化率和光合氮利用效率一般都高于常绿植被, 其变异主要源于植物的比叶重和叶片内部氮素分配的差异。2)叶片最大羧化速率随叶氮含量的变化存在季节和年际变异。在没有受到水分胁迫的年份中, 叶片最大羧化速率随叶氮含量变化的速率一般在春季或夏季最高, 其季节变异与比叶重和叶氮在Rubisco的分配比例的季节变化有关。受到干旱的影响, 叶片最大羧化速率随叶氮含量的变化率会升高。3)当大气CO 2浓度增加时, 由于叶片中Rubisco含量的降低, 多年生针叶叶片最大羧化速率和叶氮关系斜率值会出现降低; 当供氮水平增加时, 叶片最大羧化速率和叶片氮含量均表现出增加趋势, 二者线性关系的斜率也相应增加。在此基础上, 该文指出在模拟叶片最大羧化速率与叶氮含量的关系时, 应考虑叶片比叶重和叶氮在Rubisco中的分配比例的季节变异、水分胁迫、大气CO 2浓度和供氮水平变化对二者关系的影响。囿于数据的有限性, 今后应进一步加强多因子控制实验研究, 深入探讨叶片最大羧化速率与叶氮含量关系的变异性机理, 并获得更系统的观测数据, 以助生态系统过程模型的改进, 提高模型的模拟精度。 相似文献
11.
利用开顶式气室(OTC)系统,设正常大气CO 2浓度和CO 2浓度升高200 μmol·mol -12个CO 2浓度处理,模拟大气CO 2浓度升高对八宝景天光合生理和生长发育的影响.结果表明: 大气CO 2浓度升高使八宝景天叶片上、下表皮气孔密度分别显著下降16.1%和16.7%,使叶片维管束增粗,导管增多,靠近上表皮细胞增大;CO 2浓度升高可以显著增加傍晚时八宝景天叶片光合色素含量,使夜间净光合速率、气孔导度和蒸腾速率显著增加.初花期傍晚,CO 2浓度升高使叶片苹果酸含量显著下降64.0%,纤维素含量显著增加20.8%.盛花期清晨,CO 2浓度升高使叶片苹果酸含量显著增加27.0%,对糖类物质含量影响不显著,植株的分枝数、单株茎质量和单株总生物量显著增加.CO 2浓度升高可以促进八宝景天光合作用,有利于植株生长. 相似文献
12.
利用开顶式气室(OTC)系统,设正常大气CO 2浓度和CO 2浓度升高200 μmol·mol -12个CO 2浓度处理,模拟大气CO 2浓度升高对八宝景天光合生理和生长发育的影响.结果表明: 大气CO 2浓度升高使八宝景天叶片上、下表皮气孔密度分别显著下降16.1%和16.7%,使叶片维管束增粗,导管增多,靠近上表皮细胞增大;CO 2浓度升高可以显著增加傍晚时八宝景天叶片光合色素含量,使夜间净光合速率、气孔导度和蒸腾速率显著增加.初花期傍晚,CO 2浓度升高使叶片苹果酸含量显著下降64.0%,纤维素含量显著增加20.8%.盛花期清晨,CO 2浓度升高使叶片苹果酸含量显著增加27.0%,对糖类物质含量影响不显著,植株的分枝数、单株茎质量和单株总生物量显著增加.CO 2浓度升高可以促进八宝景天光合作用,有利于植株生长. 相似文献
13.
该文选择红藻门大型植物龙须菜( Gracilaria lemaneiformis)作为研究对象,通过黑白瓶法筛选出有机试剂POPSO(哌嗪-N,N-双(2-羟基乙烷磺酸)),能较好地缓冲室内龙须菜培养中介质pH的波动。在此基础上,探讨了POPSO对龙须菜生长的影响,结果表明:15 mmol·L -1及以上浓度的POPSO能较好地稳定介质pH值,减少系统中DIC浓度的急剧变化,但POPSO对CO 2浓度波动不起作用;试验结果还表明,介质中的CO 2浓度与龙须菜的生长速率间存在着类似酶动力学方程的关系,当介质中的CO 2浓度下降到5.25 μmol·L -1以下时,龙须菜生长出现抑制现象。相对稳定pH的培养环境,更有利于介质DIC中的HCO -3、CO 2-3向CO 2的转换,缓解龙须菜生长的C抑制。 相似文献
14.
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Van Wyk, J. J., and Clark, W. M. The luminosity and chromaticity of indicators as a function of pH. J. Amer. Chern. Soc, 69, 1296-1301. 1947.
Hamre, Christopher J. Hematopoiesis in the bone marrow of rats recovering from nutritional anemia. J. Lab. & Clin. Med, 32, 756-76. 1947.
Limarzi, Louis R. Evaluation of bone marrow concentration techniques. A modified method for the simultaneous preparation and staining of blood and bone marrow films. J. lab. & Clin. Med, 32, 782-40. 1947.
Heath, O. V. S. Role of starch in light-induced stomatal movement, and a new reagent for staining stomatal starch. Nature, 159, 647-8. 1947.
Cohen, H. A. A new quick method for staining Treponema pallidum. Acta Med. Orientalia, 6, 99-100. 1947.
Henry, H., and Stacey, M. Histochemistry of the Gram-staining reaction for micro-organisms. Proc. Roy. Soc, Ser. B. Biol. Sci, 133, 891-406. 1946.
Para, M. Silver impregnation of spirochetes in tissue sections. Arch. Path, 42, 649. 1946.
Ruiz, Merino, J. A method of staining capsules. Rev. Sanidad e Hig. Publ (Madrid), 20, 1112. 1946. 相似文献
15.
针对切花红掌日光温室冬季生产时CO 2亏缺严重的现象,以不增施CO 2为对照,研究了增施700、1000、1300 μmol·mol -1浓度CO 2对切花红掌‘火焰’光合特性和生长发育的影响.结果表明: 增施60 d CO 2,红掌叶片的净光合速率、胞间CO 2浓度和水分利用效率均显著提高,且以1000 μmol·mol -1处理的增幅最大;而气孔导度则较对照显著下降.增施CO 2后,红掌叶片的可溶性糖、淀粉和可溶性蛋白含量均较对照显著增加,佛焰苞大小、色泽、花茎长度等切花品质参数,以及叶片发育质量参数和花茎生长速率均有不同程度的提高,且均以1000 μmol·mol -1浓度最佳.增施1000 μmol·mol -1的CO 2可以有效促进日光温室切花红掌的冬季生产. 相似文献
16.
Under physiological pH conditions (pH 7.2-7.4) the rate constant of the reaction NO + O 2 yielding peroxonitrite (ONOO) was determined as k = (3.7 ± 1.1) × 10 7 M 1 s 1. The decay of peroxonitrite at this pH follows first order kinetics with a rate constant of 1.4 s 1. At alkaline pH peroxonitrite is practically stable.
Possible consequences of these reactions for the biological lifetime of EDRF will be discussed. 相似文献
17.
针对切花红掌日光温室冬季生产时CO 2亏缺严重的现象,以不增施CO 2为对照,研究了增施700、1000、1300 μmol·mol -1浓度CO 2对切花红掌‘火焰’光合特性和生长发育的影响.结果表明: 增施60 d CO 2,红掌叶片的净光合速率、胞间CO 2浓度和水分利用效率均显著提高,且以1000 μmol·mol -1处理的增幅最大;而气孔导度则较对照显著下降.增施CO 2后,红掌叶片的可溶性糖、淀粉和可溶性蛋白含量均较对照显著增加,佛焰苞大小、色泽、花茎长度等切花品质参数,以及叶片发育质量参数和花茎生长速率均有不同程度的提高,且均以1000 μmol·mol -1浓度最佳.增施1000 μmol·mol -1的CO 2可以有效促进日光温室切花红掌的冬季生产. 相似文献
18.
Cyclograpsus lavauxi H. Milne Edwards, 1853 occurs under boulders near the littoral fringe, where it is wetted only briefly, if at all, in each tide. Mean water content of sea-water equilibrated crabs was 62.3 % of body weight. On warm, windy days crabs on the shore lose > 17.5% of body water. Water loss for crabs of 1.6 g mean body weight was 0.29 % water content · h −1 · mm Hg saturation deficit −1, which is similar to that of species occupying positions lower on the shore. C. lavauxi is, however, able to tolerate comparatively greater losses of body water (up to 36%) compared with species from lower shore levels. As the gills dry, the lamellae separate into regular clumps which may help to maintain gas exchange. Resting oxygen consumption (Vo2) after 3–5 h settlement was similar in water and air. During enforced activity, Vo2 increased by factors of 5.3 in water and 2.6 in air at a standardized body weight of 1.5 g, indicating an appreciable aerobic scope in both media. Loss of up to 16% of body water did not depress resting aerial Vo2 or aerobic scope. In resting crabs there was no change in haemolymph pH after 24 h of either immersion or emersion, but haemolymph [Ca2+], [HCO−3] + [CO2−3], and calculated Pco2 all rose in air relative to aquatic values. These results suggest that cuticular or other endogenous CaCO3 is mobilized to compensate the respiratory acidosis in air. The implications of such physiological properties for aquatic and aerial activity on the shore are discussed. 相似文献
19.
LEGGETT, W. F. Ancient and Medieval Dyes. 5 × 8 in. 96 pp. Cloth. Chemical Publishing Co., Brooklyn, N. Y. 1944. $2.25.
Microtechnic In General. McCARTNEY, J. E. A new immersion oil “polyric”. J. Path. & Bact., 56, 265-6. 1944.
NICKERSON, MARK. A dry ice freezing unit for rotary microtomes. Science, 100, 177-8. 1944.
Dyes And Thedx Biological Uses. BERGEIM, FRANK H., and BRAKER, WILLIAM. Homosulfanilamides. J. Amer. Chem. Soc., 66, 1459. 1944.
CALDWELL, W. T., TYSON, F. T., and LAUER, LOTHAR. Substituted 2-sulfonamido-5-aminopyridines. II. J. Amer. Chem. Soc., 66, 1479. 1944.
JOHNS, C. K. Dye concentration in resazurin tablets. Amer. J. Pub. Health, 34, 955-8. 1944.
SMITH, WINSLOW WHITNEY. Relative sensitivity of different phases of growth curve of Bact. salmonicida to alkaline acriflavine. Proc. Soc. Exp. Biol. & Med., 56, 240-2. 1844.
VAN ARENDONK, A. M., and SHOULE, H. A. Dialkylaminoalkyl derivatives of substituted quinolines and quinaldines. J. Amer. Chem. Soc., 66, 1284. 1944.
WHEELER, KEITH, and DEGERING, E. F. Preparation and properties of certain derivatives of sulfamide. J. Amer. Chem. Soc., 66, 1242. 1944.
Animal Microtechnic. BOARDMAN, EDWARD T. Methods for collecting ticks for study and delineation. J. Parasitology, 30, 57-9. 1944.
DICKIE, MARGARET M. A new differential stain for mouse pituitary. Science, 100, 297-8. 1944.
GOVAN, A. D. TELFORD. Fat staining by Sudan dyes suspended in watery media. J. Path. & Bact., 56, 262-4. 1944.
LILLIE, R. D., and ASHBURN, L. L. Supersaturated solutions of fat stains in dilute isopropanol for demonstration of acute fatty degenerations not shown by Herxheimer technic. Arch. Path., 36, 432. 1943.
MULLEN, J. P. A convenient and rapid method for staining glycogen in paraffin sections with Best's carmine stain. Amer. J. Clin. Path., Tech. Sect., 8, 9-10. 1944.
NYKA, W. A method for staining the rickettsiae of typhns in histological sections. J. Path. & Bact., 56, 264. 1944.
POPPER, HANS, GYORGY, PAUL, and GOLDBLATT, H. Fluorescent material (ceroid) in experimental nutritional cirrhosis. Arch. Path., 37, 161. 1944.
SMALL, C. S., and SCHULTZ, M. A. Sustaining faded tissue sections. Amer. J. Clin. Path., Tech. Sect., 7, 66-7. 1943.
YOFFEY, J. M., and PARNELL, J. The lymphocyte content of rabbit bone marrow. J. Anat., 78, 109-12. 1944.
ZIEGLER, E. E. Hematoxylin-eosin tissue stain. An improved, rapid, and uniform technic. Arch. Path., 37, 68. 1044.
Plant Microtechnic. HAASIS, FERDINAND W. Staining rubber in ground or milled plant tissues. Ind. and Eng. Chem., Anal. Ed., 16, 480. 1944.
PARRIS, G. K. A simple nuclear stain and staining technique for Helminthosporia. Phytopathology, 34, 700. 1944.
Microorganisms. DARZINS, E. Rickettsienstudien. Zentbl. Bakl., Abt. I, Orig., 151, 18-20. 1943.
GOHAR, M. A. A staining method for Corynebacterium diphtheriae. J. Bact., 47, 575. 1944.
GRAY, P. H. H. Two-stain method for direct bacteria count. J. Milk Techn., 6, 76. 1943. 相似文献
20.
When the CO 2 concentration in the atmosphere above an intact barley leaf was lowered in the dark after illumination, chlorophyll a luminescence and chlorophyll a dark fluorescence were stimulated. The stimulation was induced by lowered levels of CO 2 in a wide concentration range including concentrations well above that saturating photosynthesis. The stimulation of luminescence by lowered CO 2 concentrations was more pronounced after far-red excitation than after white light excitation. The difference in response to lowered CO 2 concentrations after white/far-red excitation was less pronounced for fluorescence than for luminescence. Stimulation of luminescence was more pronounced when the CO 2 concentration was lowered in an O 2-containing atmosphere than under anaerobic conditions. It is concluded that lowering of the CO 2 concentration in the dark after illumination causes a partial reduction of the primary Photosystem II acceptor Q A. 相似文献
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