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     The activity of E.
     淀粉酶活性在50℃,pH 6.0条件下最高.
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     The transketolase activity of Z.
     结果表明在Z.
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  activity
Synthesis and Cytotoxic Activity of 6-(Substituted-Phenyl)Amino-5,8-Quinazolinediones
      
Design, Synthesis and Growth Inhibition Activity of Bis-Epoxyethyl Derivatives of Stallimycin Modified on the Amidino Moiety
      
BIOLOGICAL ACTIVITY AND NEW TRENDS IN THE CHEMISTRY OF ISOQUINOLINE ALKALOIDS
      
Statistically significant correlation (r>amp;gt;0.905) was obtained between the physicochemical parameters and biological activity.
      
These studies may be useful in designing molecules with better cyclooxygenase-2 inhibitory activity.
      
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By surrounding a photo-neutron source of Ra+Ee with a thin spherical sbell of paraffin, a continuous spectrum of scattered neutrons, extending from zero energy to the energies of the primary neutrons is obtained. When a silver detector is exposed to such a spectrum, a part of the neutrons having just the energies at resonance with the silver nuclei is strongly absorbed by the detector and thereby produces the induced β-activity. By measuring the activity of silver and the apparent absorption coefficient...

By surrounding a photo-neutron source of Ra+Ee with a thin spherical sbell of paraffin, a continuous spectrum of scattered neutrons, extending from zero energy to the energies of the primary neutrons is obtained. When a silver detector is exposed to such a spectrum, a part of the neutrons having just the energies at resonance with the silver nuclei is strongly absorbed by the detector and thereby produces the induced β-activity. By measuring the activity of silver and the apparent absorption coefficient of the resonance neutrons in a thin silver absorber, the total width of the resonance levels effective to neutron capture and located in the above spectrum is estimated. Let τ He the average value of one half of the half-value width of the resonance levels, expressed in volts, and n be the number of resonance levels here concerned. We find nτ=260 volts for the silver nuclei of half period 22" if the energies of the primary neutrons are taken to be 2x 105 volts. Knowing nτ, we can evaluate the average spacing between adjacent resonance levels effective to neutron capture by giving a plausible value to τ. We find a spacing of the order 80-800 volts if τ be given the value 0.1-1.0 volt. This result is in good accord with the recent theoretical calculation of Bethe and also with observations of resonance groups in the low energy region.

把‘镭—铍’所产生的‘光中子’,穿过一层半厘米厚的白蜡,我们便得到一‘连续的中子谱’。他们中间有些中子,能和银的原子核起‘共振作用’,因此可以被银片吸收,而产生‘人工放射银’先测量人工放射的强度和‘共振中子’在银片中的吸收率,再应用原子核内共振能层的宽度,我们便可以求出银的原子核内‘共振能层’的密度大约共振能在零和二十万伏特中间,平均每隔一二百伏特便有一可以吸收质子的共振能层,和理论很相符合。

Pleonomus canaliculatus Falderm. is one of the most destructive soil-inhabitinginsects to wheat in Honan. It causes considerable losses to the crop in spring bycutting the underground part of the stems, causing withering and death of the plant.The life history, distribution, host plants, morphology and rearing methods of theinsect are given in this paper. The overwintering adults become active in spring. Eggs are laid in the topsoil about the plant. They hatch in 5-8 weeks and the larvae grow to maturity inat...

Pleonomus canaliculatus Falderm. is one of the most destructive soil-inhabitinginsects to wheat in Honan. It causes considerable losses to the crop in spring bycutting the underground part of the stems, causing withering and death of the plant.The life history, distribution, host plants, morphology and rearing methods of theinsect are given in this paper. The overwintering adults become active in spring. Eggs are laid in the topsoil about the plant. They hatch in 5-8 weeks and the larvae grow to maturity inat least 15 months. Pupation takes place during late August up to mid-septemberand the pupal stage requires about 2 weeks. The young adults remain and overwinterin their pupal cells. Fall plowing to a depth of 6 to 9 inches soon after the harvest of summer cropswill destroy a great number of pupae and young adults by breaking up their cells inthe soil. The larvae are thus turned up and exposed to the predators. Rotation ofcrops by using sesame or legumes instead of millet preceding wheat, and summerfallow of the land are found to be helpful to lessening the infestation. Control may be effective by dusting γ-BHC (at,1.5 to 2.5 kgs of 0.5% γ-BHC permow mixed with 3 parts of dry soil or sand) into the top soil by means of a tripodhand-driller between the rows just before the activity of wireworms in spring.

1.沟金针虫需2年以上完成一代生活史。越冬成虫2月下旬出土,3月中旬至4月中旬为活动盛期,产卵在1至2寸表土内,卵于5月初孵化,卵期为5至8星期。老熟幼虫8月下旬开始化蛹。9月中旬起羽化,蛹期约2星期。成虫羽化后即行越冬。 2.越冬幼虫2月底至3月中旬开始向表土活动(10厘米处地温8—12℃左右),3月中旬及4月全月是为害盛期(80%以上幼虫集中在1至2寸之表土内),8月至12月表土之幼虫密度极小(仅有虫1.2—6.8%),不致为害成灾。 3.沟金针虫之天敌除一种壁虱(Cheyletus sp.)和一种蜘蛛及蚂蚁外,尚有寄生菌2种,具中一种经鉴定为冬虫夏草(Cordyceps sp.)之一种。 4.小麦整地时适当深犁(5—7寸)并精耕细作能毁杀大部分蛹体及成虫,并可将幼虫翻上来供鸟类捕食(9,10月间97%老熟幼虫,在5—7寸土内化蛹及羽化,同时88%幼虫分布于1—7寸土内)。此外以芝麻与豆类为小麦前作及夏季休间结合翻耕曝晒亦能减少虫害损失。 5.沟金针虫在河南的主要为害期系在春季,所以早春於麦行间耩666毒土或毒沙以毒杀向表土上升之幼虫是值得继续研究的。

By continuous perfusion with calcium free Ringer solution, the activity of the hypodynamic toad heart may be augmented with certain phosphatides or soaps. Among those lipids, crude soy-bean phosphatides are most powerful. Crude egg yolk phosphatides and its alcoholic insoluble fraction and sodium or ammonium oleates are also effective; whereas the alcohol soluble fraction of egg yolk phosphatides(i.e. lecithin) and potassium oleate are ineffective. The perfusion fluids, which revive the activities of the...

By continuous perfusion with calcium free Ringer solution, the activity of the hypodynamic toad heart may be augmented with certain phosphatides or soaps. Among those lipids, crude soy-bean phosphatides are most powerful. Crude egg yolk phosphatides and its alcoholic insoluble fraction and sodium or ammonium oleates are also effective; whereas the alcohol soluble fraction of egg yolk phosphatides(i.e. lecithin) and potassium oleate are ineffective. The perfusion fluids, which revive the activities of the hearts and which are drained after experiments contain about 1/8 to 1/4 the quantity of calcium of normal Ringer. Such calcium is speculated to be liberated from the cardiac tissue. In conclusion, the presence of a minute quantity of calcium in the perfusing fluid is necessary to aid the action of phosphatides in maintaining the contractility of the hearts.

(一)在無鈣任氏液中,蟾蜍心臟搏動停止,某些磷脂和皂類可以使心臟搏動恢復,並維持幾小時。 (二)在上述情况中,有效的脂類為大豆磷脂、粗製雞卵璘脂及其不溶於酒精的部分、油脂酸鈉和油脂酸銨等;溶於酒精的雞卵磷脂和油脂酸鉀,並無作用。 (三)心搏在無鈣任氏液中經磷脂作用而恢復後,鈣自心肌向灌流液釋出。 (四)心肌鈣質或灌流液中存在的微量鈣質是磷脂對心肌的興奮作用所必需。

 
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