Sterols of the lobster (Homarus americanus) and the shrimp (Pandalus borealis)

Summary In this study we have analyzed the sterol compositions of two continental shelf species of crustacea, the lobster (Homarus americanus) and the shrimp (Pandalus borealis). Cholesterol was found to be the most abundant sterol in these two species with smaller amounts of desmosterol, 24-methylcholesterol, 24-ethylcholesterol, 24-methylenecholesterol and 22-dehydrocholesterol. Woods Hole Oceanographic Institution Contribution Number 3494. This work was supported by the Office of Sea Grant of the National Oceanic and Atmospheric Administration, U.S. Department of Commerce. Special thanks are extended to Ms.R. Beebe-Center, who was responsible for a large part of the isolation work described here.     

Effects of Si and Ce on the microstructure and hydrogen storage property of Ti_(26.5)Cr_(20)V_(45)Fe_(8.5)Ce_(0.5) alloy

In this paper,the effects of Si and Ce on the microstructure and hydrogen storage property of Ti26.5 Cr20V45Fe8.5Ce0.5 alloy were studied,respectively.First of all,effects of Si on the microstructure and hydrogen storage properties of Ti26.5Cr20(V45Fe8.5)1-xSixCe0.5(x=0,0.5,1.0,1.5 and 2.0 at%)alloys were studied by X-ray diffraction,scanning electron microscopy and P-C isotherm measurements.As the Si addition increases,the hydrogen absorption capacities of alloys decrease but the equilibrium pressure incre...     

Experiments on the sense of time inTalitras saltator (Montagu) (crustacea-amphipoda)

Riassunto Il Crostaceo AnfipodeTalitrus saltator (Montagu) possiede un meccanismo di orientamento solare che gli permette, mediante una variazione regolare e continua dell'angolo di orientamento nel corso del giorno, di mantenere una direzione di fuga praticamente costante. Esemplari del litorale tirrenico, trasportati in Argentina, hanno assunto un angolo di orientamento col sole conforme all'ora italiana nel momento della esperienza. Ciò dimostra che la regolazione dell'angolo di orientamento è dovuta ad un fattore endogeno e cioè che esiste inTalitrus un senso del tempo.     

聚合质量比对Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19／PAn复合体系微波吸收性能的影响

用原位聚合法制备了Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19铁氧体／聚苯胺（PAn）复合材料。采用X射线衍射（XRD）、扫描电子显微镜（SEM）对样品的结构、微观表面形貌和粒子大小进行了表征,用微波矢量网络分析仪测量样品在2～12．4GHZ频率范围内复介电常数和复磁导率,根据测量数据计算微波反射率R与频率f的关系。研究结果表明：PAn包覆于掺杂锶铁氧体表面,PAn／Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19复合材料具有良好的吸波性能,随着掺杂锶铁氧体含量的增加,微波吸收匹配厚度和吸收带宽发生变化：当Sr0．7La0．15Ce0．15Fe11.7Zn0．3O19聚合质量比为40％时,最佳匹配厚度为2．6mm,吸收峰值接近-40dB,峰值频率高于12．4GHz,大于10dB吸收带宽预计达到55GHz。     

Activation with (±)N-n-propyl-nor-apomorphine (NPA) of the male rat copulatory behavior

Summary I.p. (±)N-n-propyl-nor-apomorphine HCl (NPA) influences copulatory behavior of vigorous adult male rats in the same ways as apomorphine, i.e., it reduces the latency to ejaculation as well as mount and intromission frequency. Furthermore, NPA administered to impotent male rats restores normal mating behavior in some of them.     

The histology of the retina ofPomatoschistus (Gobius)microps (Krøyer)

Zusammenfassung Der histologische Bau der Netzhaut vonPomatoschistus microps, insbesondere der Sehzellen in Hell- und Dunkelstellung, wurde untersucht. Die Zapfen sind gestaffelt und bilden ein regelmässiges Mosaik: Reihen von Zwillingszapfen alternieren mit Reihen von Einzelzapfen. Die Aussenglieder der Zwillingszapfen unterscheiden sich färberisch voneinander und sind ihrerseits regelmässig in das Mosaik eingeordnet.     

Occurrence of dihydromurexine (Imidazolepropionylcholine) in the hypobranchial gland ofThais (purpura)haemastoma

Riassunto Gli estratti metanolici di organo ipobranchiale diThais (purpura)haemastoma contengono cospicui quantitativi di un nuovo estere della colina, la diidromurexina o imidazolpropionilcolina. La base è localizzata esclusivamente nella striscia mediana giallastra dell'organo ipobranchiale, ove può raggiungere concentrazioni dell'ordine di 15–17 mg per g di tessuto fresco.

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Supported by grants from the Consiglio Nazionale delle Ricerche, Roma.     

Gibberellin-sugar interaction regulating the growth habit of bermudagrass (Cynodon dactylon (L) Pers)

Zusammenfassung Saccharose und Glucose unterbinden die von schwachem Licht erzeugte negativ geotropische Kurvatur von Bermudagrasausläufern. Gibberellinsäure erzeugt eine Umkehrung dieses hemmenden Effekts.     

Chiasmate type of meiosis in the roachNauphoeta cinerea (Oliver) (Fam: Blattidae)

Résumé Nauphoeta cinerea est un des Cafards chez lesquels le chiasma de la méiose a été nettement observé. Ce cas vient à l'appui de l'assertion deSuomalainen selon laquelle des chiasmas se présenteraient sous une forme soit «cachée» soit «visible» chez tous les Cafards. La «méiose sans chiasma» queJohn etLewis supposent existes au moins chezP. americana n'est pas non plus confirmée par nos recherches.

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I wish to thank one of the research scholars of the Department, Mr. V. L.Kallapur, for sparing readily some specimens of the roach for my work. Constructive criticisms by my colleague Dr. R. M.Patil are also acknowledged.     

The effect of terbutaline (PINN) 1-(3.5-dihydroxyphenyl)-2-(t-butylamino)-ethanol on the choledochoduodenal sphincter

Zusammenfassung Die- Rezeptoren vom Sphinkter von Oddi werden durch Terbutalin selektiv stimuliert.     

Role of the Lewis (Le-le) and secretor (Se-se) systems in the rejection of kidney grafts]

ABH and Lewis antigens are secreted in distal convoluted and collector tubes of the kidney. The renal ABH secretion is genetically controlled by the Se-se system, while the Lewis specificities are controlled by the Le-le system. The secretory status of the recipient does not modify the probability of graft survival, while the Lewis phenotype seems to play a major role in rejection. The probability of graft survival at 2 years in le-le homozygous recipients (29%) is much lower than that of Le recipients (58%) p less than 0.01.