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Directional sensitivity of auditory ascending neuron in the bushcricket Gampsocleis gratiosa

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Chinese Journal of Acoustics 1990年第2期9卷 170-176页

作者： SHEN Junxian(institute of biophysics, academia sinica, Beijing))

Quantitative analyses on phonotactic behavior of the bushcricket have demonstrated that the bushcricket possesses good capability to determine direction of sound source. The morphological structure, laterality and directional sensitivity of the auditory ascending neuron in the prothoracic ganglion of the bushcricket have been studied. At its best frequency of 15 kHz, the laterality threshold difference of the neuron is great up to about 16 dB. Its directional sensitivity depends closely on stimulus frequency. The higher the stimulus frequency, the greater the directional threshold differences. Spike count and latency shift of the ascending neuron in response to each stimulus depend on the angle of incidence of sound. Therefore, the two parameters can be used as directional cues of sound source by the ascending neuron.

关键词： Directional sensitivity of auditory ascending neuron in the bushcricket Gampsocleis gratiosa

MEASUREMENT OF TRITIUM IN NATURAL WATER

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Journal of Oceanology and Limnology 1985年第1期3卷 79-85页

作者： Li Meifen (institute of biophysics, academia sinica, Beijing) institute of biophysics Academia Sinica Beijing

A detergent-scintillation liquid mixture applied to measure low specific activity of tritium in natural water was studied. The DYS-1 low level liquid scintillation counter designed and manufactured by our institute was employed. In comparing the Triton X-100 scintillation liquid mixture with the dioxane-based-scintillation liquid, a better formula for Triton X-100 scintillation liquid mixture was determined, the mixture possesses the quality of high water content, high efficiency and low background in measuring tritium in waten Chemiluminescence of the Triton X-100 scintillation liquid mixture can be totally de-excited in short time. It can be employed at ambient temperature 11-28℃. For 20ml sample in quartz vials, counting efficiency is 15% with a background 2.17 cpm, Y=31 TU (t=30 min).

关键词： MEASUREMENT OF TRITIUM IN NATURAL WATER OC

AN ELECTROPHYSIOLOGICAL STUDY ON HEARING OF THE CICADA CRYPTOTYMPANA ATRATA FABRICIUS (HOMOPTERA: CICADIDAE)

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Chinese Journal of Acoustics 1988年第2期7卷 164-170页

作者：沈钧贤 Acad sinica China

The characteristics in response to sound and directional sensitivity of the auditory primary neurons andinterneurons of the cicada Cryptotympna atrata were studied with neurophysiological *** are tuned to a similar characteristic frequency,which is in correspondence with the dominantfrequency of calling song of the *** are able to code sound intensity within the dynamic range of 4OdB above thresholds with an increment of about two spikes per 10 *** auditory neurons possess gooddirectiond sensitivity with the threshold difference of 10—12 dB at the best frequency between contra-andipsilateral stimulations.

关键词： HOMOPTERA AN ELECTROPHYSIOLOGICAL STUDY ON HEARING OF THE CICADA CRYPTOTYMPANA ATRATA FABRICIUS

DYNAMIC MODEL OF TRANSLATION PHASE

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Science China Chemistry 1982年第10期29卷 1044-1051页

作者：陈润生 institute of biophysics Academia Sinica Beijing

In order to elucidate the origin of biological ordering structure, which is far from equi-librum and continuously exchanges substances with its environment, I. Prigogine advancedthe theory of dissipative structure and discussed the formation of this structure in a dynamicsystem. Xu Jinghua and Ding Dafu also presented a model of dissipative structure of DNAtemplate replication and obtained an interesting result of helix structure. In this paper we pre-sent a dynamic model. of protein synthesis and consider possible influences of position-controlfactors in oosperm, attempting to obtain some ideas about the primary cause of morphodif-ferentiation.

关键词： DYNAMIC MODEL OF TRANSLATION PHASE Pro mRNA

HsaI: A RESTRICTION ENZYME FROM HUMAN BEING

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Science in China,Ser.B 1986年第9期29卷 947-953页

作者：劳为德陈受宜 institute of biophysics academia sinica Beijing

The HsaI restriction enzyme from the embryos of human, Homo sapiens, has been isolated with both the tissue extract and nnelear extract. It proves to be an unusual enzyme, clearly related functionally to Type Ⅱ endonuclease. HsaI seems to be an isoschizomer of EcoRI, but it has a distinctive property of elation, differing from EeoRI. Upon SDS-polyacrylamide gel electrophoresis, the enzyme preparation showed Coomassie blue staining bands, having the molecular weight of 65,000 and 22,000 daltons in size, respectively.

关键词： HsaI A RESTRICTION ENZYME FROM HUMAN BEING

~1H NMR INVESTIGATION OF THE BINDING OF METHYL-β-D-GALACTOSES WITH SIALIC ACID RESIDUES ON HEPATIC BINDING PROTEIN——THE EFFECT OF DIVALENT CALCIUM ION

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Science in China,Ser.B 1986年第2期29卷 156-164页

作者：王金凤 institute of biophysics academia sinica Beijing

The present study is a proton NMR investigation of the influence of Ca2+ on the interaction between the intact sialic acid residues on HBP （Hepatic Binding Protein） and methyl-β-D-galactoses. The proton NMR spectra of HBP and methyl-β-D-galactose mixing solution at different Ca2+ concentratiou have been measured. The analysis of the experimental results indicates that Ca2+ participates in the binding of sialic acid residues on HBP with methyl-β-D-galactoses and this enables the galactose molecules to, be in stable bound state. The proton NMR spectra of the samples containing EDTA have confirmed this conclusion.

关键词： NMR INVESTIGATION OF THE BINDING OF METHYL THE EFFECT OF DIVALENT CALCIUM ION D-GALACTOSES WITH SIALIC ACID RESIDUES ON HEPATIC BINDING PROTEIN ACID

MECHANISM OF SOFT X-RAY RADIATION DAMAGE ON GLYCINE BY XPS

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Science in China,Ser.B 1982年第2期25卷 176-182页

作者：田佩珠郁向荣 institute of biophysics academia sinica institute of Chemistry academia sinica The Beijing Center of Physical and Chemical Analysis

This paper roports the behaviour of radiation damage of solid glycine in a XPS spectrom-ter equipped with Mg and Al X-ray sources. The main results are as follows: (i) the kinet-ics of the damage process obeys the first-order rate law, (ii) decarboxylation can be deduced,and (iii) deamination does not occur, but the nitrogen atoms in original molecules are trans-formed into a new chemical form with higher electron density by photo-reduction.

关键词： MECHANISM OF SOFT X-RAY RADIATION DAMAGE ON GLYCINE BY XPS AI

MECHANICAL CHARACTERISTICS AND SOUNDING MECHANISM OF SOUNDING MEMBRANE IN BLACK CICADA(C. atrata Fabricius)

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Science China Chemistry 1989年第1期32卷 64-77页

作者：蒋锦昌 institute of biophysics Academia Sinica Beijing

In this paper, the geometric structure and the mechanical characteristics of the sounding membrane (SM) are given, and the acting properties of the sounding movement of sM are *** is an elastic membrane with a non-linear structure. At contracting point, the elastic pressure and the rebounding force are about 0.146 N and 0.044 N, respectively. In the lower half, the rigidity of the convex-like shell increases obviously, its force constant is about 0.4 N/ram. In the upper half, the middle section of the three long ribs narrows, thickens and stiffens, with a breaking pressure of about *** forced sounding movement of SM shows that the movement of SM travels along the membrane in the lower half from the contracting point and drives the three long ribs to buckle in turn and to produce a syllable to be basically the same as free song, that is, it consists of the three amplitude-modulation pulse trains of which the main peak frequency of the carrier wave is about 4.8 kHz. The buckling movement

关键词： black cicada sounding membrane geometric structure mechanical property sounding mechanism.

SONG PRODUCTION AND HEARING IN THE BUSHCRICKET DERACANTHA ONOS (ORTHOPTERA, TETTIGONIIDAE)

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Chinese Journal of Acoustics 1988年第1期7卷 83-89页

作者：沈钧贤关力 Inst of biophysics China

The basic features of song pattern,stridulatory mechanism and auditory sensitivity in thebushcricket species Deracantha onos were studied with sond analysis and *** bushcricket uses an elytro-elytral mechanism of sound production:a denticulatedvein(file)on the under-surface of the left elytron is rubbed by the inside edge(plectrum)of the rightelytron at the rate of 30—33/*** a few teeth does not influence the rhythm of the motorneurons innervating the *** file-train of pulses is the element of calling song of ***-train of pulses is composed of one elytra-opening pulse and 11 to 13 elytra-closing tooth *** tooth impact of the file at the plectrum elicts a damped oscillation called'tooth pulse'.The rateof tooth pulses is about 450/*** frequency spectrum of the song covers a wide frequency bandmainly between 6 and 30 kHz with a predominant peak at 12 to 14 *** intensity is about 110 dBat 10cm from the *** best sensitivity of heari

关键词： SONG PRODUCTION AND HEARING IN THE BUSHCRICKET DERACANTHA ONOS ORTHOPTERA,TETTIGONIIDAE