Autor: RH. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: The effect of luteolin on spermatological parameters, apoptosis, oxidative stress rate in freezing rabbit semen
Autorzy:: Akarsu, S.A.
Acısu, T.C.
Güngör, İ.H.
Çakır Cihangiroğlu, A.
Koca, R.H.
Türk, G.
Sönmez, M.
Gür, S.
Fırat, F.
Esmer Duruel, H.E.
Powiązania:: https://bibliotekanauki.pl/articles/16647483.pdf
Data publikacji:: 2023
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:: rabbit
semen
cryopreservation
luteolin
oxidative stress
apoptosis
Opis:: The aim of the present study was to determine the effects of Luteolin (LUT) on semen quality, oxidative stress, apoptosis, acrosomal integrity, mitochondrial membrane potential and dead sperm ratio in rabbits. Ejaculates from six New Zealand rabbits were collected, evaluated and pooled. The pooling was divided into five groups as control (no additive) LUT 25 μM, LUT 50 μM, LUT 100 μM and LUT 200 μM and LUT added. It was then filled into a falcon tube with Tris-based extender at a final concentration of approximately 35 x 106 spermatozoa. Diluated rabbit semen samples were drawn into frozen and thawed. Frozen semen straws were thawed at 37°C in 30 seconds. According to our findings, no statistical difference was found between all doses of luteolin and the control group in the CASA (computer assisted sperm analysis) analysis performed at 4°C. However, total motility, progressive motility and rapid sperm percentage were found to be higher in the frozen and thawed rabbit semen at a dose of LUT 50 μM compared to the other groups (p<0.05). While amplitude of lateral head displacement (ALH) and beat cross-frequency (BCF) values were found at the lowest dose of LUT 200 μM, a statistically significant difference was observed between the other groups. When the flow cytometry results were examined, no statistical difference was found between the rate of dead sperm, acrosomal integrity, mitochondrial membrane potential and apoptosis rate. Morever, the H2O2 percentage was found to be lower in all experimental groups compared to the control group (p<0.001). In conclusion, the addition of LUT in long-term storage of rabbit semen provided a protective effect for spermatozoa with its antioxidative properties against damage caused by cryopreservation.
Źródło:: Polish Journal of Veterinary Sciences; 2023, 26, 1; 91-98
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 2.

Tytuł:: Structure and electrochemical behaviour of weldments of titanium Grade 1 in a bromine-containing solution
Autorzy:: Ilieva, M.D.
Ferdinandov, N.V.
Gospodinov, D.D.
Radev, R.H.
Powiązania:: https://bibliotekanauki.pl/articles/2175743.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: titanium Grade 1
hollow cathode arc discharge welding
electrochemical corrosion
cathodic loop
tytan Grade 1
spawanie łukowe z pustą katodą
korozja elektrochemiczna
pętla katodowa
Opis:: Purpose: The presented research aims to determine the microstructural changes in weldments of commercially pure titanium Grade 1 after welding by hollow cathode arc discharge in vacuum and related changes in the corrosion behaviour of the weldments. Design/methodology/approach: Macro and microstructure of weldments were studied using optical microscopy. Corrosion behaviour of untreated Grade 1 and heat-affected zone of weldments of Grade 1 was investigated using electrochemical testing, including open circuit potential measurements and potentiodynamic polarisation. As an aggressive environment, 1 M KBr water solution was used. Findings: Welding by hollow cathode arc discharge in vacuum leads to the formation of a coarse Widmanstätten structure in the heat-affected zone. This imperfect structure results in a passive layer with worsened protective properties, thus increasing the corrosion rate of weldments by up to two orders of magnitude compared to Grade 1 in as-received condition. The passive layer on the welded surfaces did not allow Grade 1 to acquire a stable corrosion potential during potenitodynamic polarization. Research limitations/implications: Titanium and its alloys are passivating metallic materials, and their corrosion resistance depends on the properties of a thin protective surface layer. Changes in the underlying metal microstructure can affect the passivation behaviour of titanium and the properties of this layer. Welding by hollow cathode arc discharge in vacuum alters the microstructure of heat-affected zone, thereby causing Widmanstätten microstructure to form. As the passive layer over that microstructure has worsened protective properties, we suggest additional heat treatment after welding to be applied. Future experimental research on this topic is needed. Originality/value: Welding by hollow cathode arc discharge in vacuum is a welding method allowing weldments to be done in a clean environment and even in space. In the specialised literature, information on the structure and corrosion resistance of weldments of commercially pure titanium Grade 1 welded by hollow cathode arc discharge in vacuum is missing. The present research fills in a tiny part of this gap in our knowledge.
Źródło:: Archives of Materials Science and Engineering; 2021, 112, 1; 5--12
1897-2764
Pojawia się w:: Archives of Materials Science and Engineering
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 3.

Tytuł:: Chemical composition and antifungal activities of Ziziphora tenuior and Z. clinopodioides essential oils against dermatophytes
Skład chemiczny i działanie przeciwgrzybicze olejków eterycznych z Ziziphora tenuior i Z. clinopodioides przeciw dermatofitom
Autorzy:: Mahboubi, M.
Tabar, R.H.
Mahdizadeh, E.
Powiązania:: https://bibliotekanauki.pl/articles/72564.pdf
Data publikacji:: 2018
Wydawca:: Instytut Włókien Naturalnych i Roślin Zielarskich
Tematy:: Ziziphora tenuior
Ziziphora clinopodioides
essential oil
chemical composition
antifungal activity
dermatophyte
Opis:: Ziziphora species are traditionally used for treatment of different infectious and non-infectious diseases as antiseptic agents. The aim of this study was to evaluate the chemical composition of Ziziphora clinopodioides and Z. tenuir essential oils and their antifungal effects againt five strains of dermatophytes. GC and GC-MS methods were used for essentional oils analize. The anti-elastase activities were determined by porcine pancreatic elastase assays. 48 different compounds were identified in these two essential oils, which thymol, p-cymene, 1,8-cineole and γ-terpinene were their major components. The anti-dermatophyte activities of essential oils against dermatophytes showed that the essential oils (150 ppm) inhibited the mycelium growth, about 5–100%, which Z. clinopodioides essential oil had higher mycelium growth inhibition (28–100%) than that of Z. tenuir oil. The MIC and MFC values of essential oils were 0.01–1 μl/ml. 0.5 μl/ml essential oils inhibited porcine pancreatic elastase, dose-dependently. Due to the anti-dermatophyte and anti-elastase effects of Ziziphora sp., it can be considered as natural antifungal agent for more clinical and pre-clinical trials.
Rośliny z rodzaju Ziziphora są tradycyjnie stosowane w leczeniu różnych chorób infekcyjnych i nieinfekcyjnych ze względu na swe działanie antyseptyczne. Celem pracy było określenie składu chemicznego olejków eterycznych Ziziphora clinopodioides i Z. tenuir oraz działania przeciwgrzybiczego przeciwko pięciu dermatofitom. Skład chemiczny olejków badano za pomocą GC i GC-MS. Działanie antyelastazowe badano z wykorzystaniem świńskiej trzustkowej elastazy. W dwóch olejkach zidentyfikowano 48 różnych składników, wśród których głównymi były tymol, p-cymen, 1,8-cyneol i γ-terpinen. Badanie aktywności antydermatofitowej olejków pokazało, że olejki eteryczne (150 ppm) hamowały wzrost mycelium o około 5–100%. Olejek eteryczny z Z. clinopodioides bardziej hamował wzrost mycelium (28–100%) niż olejek z Z. tenuir. Wartości MIC i MFC olejków eterycznych wynosiły 0,01–1 μl/ml. Stężenie 0,5 μl/ml olejków eterycznych hamowało elastazę trzustki świńskiej w sposób uzależniony od dawki. Z powodu działania antydermatofitowego i antyelastazowego Ziziphora może być uważana za naturalny środek przeciwgrzybiczy, który wymaga dalszych badań przedklinicznych i klinicznych.
Źródło:: Herba Polonica; 2018, 64, 2
0018-0599
Pojawia się w:: Herba Polonica
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 4.

Tytuł:: HIV and other STI public prevention campaigns: Vain endeavours to break risky new trends in view of blending sex and drugs
Autorzy:: Dennin, R.H.
Powiązania:: https://bibliotekanauki.pl/articles/1917733.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Medyczny w Białymstoku
Tematy:: HIV
prevention concepts
barriers
psychotropic drugs
Opis:: Although at the global level the incidence of HIV has declined there are contrary trends gaining momentum. Unimpressed by public prevention campaigns certain groups belonging to the ‘at-risk' population are engaging in risky sexual behaviour and concomitant misuse of illicit drugs thereby potentiating the odds of spreading HIV and other sexually transmitted infections (STIs). The blending of drug misuse with substantial risky sexual behaviour increases those risks and creates an almost inseparable complexity. Group-sex settings of this kind are partly organised via national and international social networks. Those people engaged in this modern trend mostly present with various health impairments thereafter, such as unconsciousness or confusion, often rendering them unable to adhere to combined antiretroviral therapy (cART) if they are HIV-infected. These people staunchly refuse to cooperate with prevention messages. Thereby public prevention efforts to curb the spread of HIV are largely wasted. But it is not just the individual’s issue; if developments of this kind are not contained serious challenges with HIV and other STIs might arise for these communities
Źródło:: Progress in Health Sciences; 2016, 6(1); 158-164
2083-1617
Pojawia się w:: Progress in Health Sciences
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 5.

Tytuł:: Characterization of Phyllosticta hostae causing Phyllosticta leaf spot on spider lily in China
Autorzy:: Yi, R.H.
Gan, L.J.
Chen, J.
Xu, X.L.
Powiązania:: https://bibliotekanauki.pl/articles/66837.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: Phyllosticta hostae
leaf spot
plant disease
spider lily
Hymenocallis littoralis
tropical plant
herb
China
Opis:: Leaf spot disease on the spider lily [Hymenocallis littoralis (Jacq.) Salisb.] continues to cause serious problems in China. To confirm the pathogen, the pathogenicity of isolates from diseased leaves was tested according to Koch’s postulates. The isolates were tentatively identified using morphological characteristics and confirmation was done by phylogenetic analysis of the translation elongation factor 1-alpha gene (TEF1), the actin gene (ACT), and internal transcibed spacer (ITS) sequences using neighbor-joining (NJ), maximum parsimony (MP), and Bayesian inference (BI) methods. The pathogen was identified as Phyllosticta hostae. Molecular analysis indicated very little diversity in the TEF1, ACT, and ITS gene. This is the first report of P. hostae causing leaf spot disease on spider lily in China.
Źródło:: Journal of Plant Protection Research; 2015, 55, 4
1427-4345
Pojawia się w:: Journal of Plant Protection Research
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 6.

Tytuł:: Quantity of hydrophobic functional CH-groups - decisive for soil water repellency caused by digestate amendment
Autorzy:: Voelkner, A.
Holthusen, D.
Ellerbrock, R.H.
Horn, R.
Powiązania:: https://bibliotekanauki.pl/articles/24134.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Instytut Agrofizyki PAN
Opis:: Anaerobic digestates are used as organic fertilizers; however, they are suspected to interfere negatively with soils.To investigate the relevance of the anaerobic digestates composition on potential wettability and contact angle of the soil, we mixed in a laboratory experiment 30 m³ ha-1 of anaerobic digesta-tes derived from mechanically pre-treated substrates from maizeand sugar beet with a homogenized Cambic Luvisol. Fourier trans-form infrared-spectra and diffuse reflectance infrared Fouriertransform-spectra of particle intact and finely ground soil-anaerobic digestates-mixtures were analyzed to determine the quantities of hydrophobic functional groups in the soil-anaerobic digestates-mixtures that are used here as an indicator for the potential hydrophobicity. The anaerobic digestates application increased the amount of hydrophobic functional groups of the mixtures and reduced the wettability of the soil. However, for intact particle samples an up to threefold higher amount of hydrophobic groups was found as compared to the finely ground ones, indicating a dilution effect of mechanical grinding on the effectivity of the organic matter that is presumably located as a coating on mineral soil particles. For the particle intact samples, the intensity of hydrophobic functional groups bands denoting hydrophobic brickstones in organic matter is indicative for the actual wettability of the soil-anaerobic digestates-mixtures.
Źródło:: International Agrophysics; 2015, 29, 2
0236-8722
Pojawia się w:: International Agrophysics
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 7.

Tytuł:: Exceptional cameral deposits in a sublethally injured Carboniferous orthoconic nautiloid from the Buckhorn Asphalt Lagerstatte in Oklahoma, USA
Autorzy:: Seuss, B.
Mapes, R.H.
Klug, C.
Nutzel, A.
Powiązania:: https://bibliotekanauki.pl/articles/22348.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: cameral deposit
Carboniferous
orthoconic nautiloid
Buckhorn Asphalt
Oklahoma
USA
Nautiloidea
Pseudorthoceratidae
predation
sublethal damage
Opis:: The cameral and intrasiphonal deposits of a Pennsylvanian straight nautiloid (Pseudorthoceratidae) are studied in order to understand the formation of these deposits. The specimens from the Buckhorn Asphalt deposit (Oklahoma) are exceptionally preserved including original aragonite and microstructures. The specimen investigated survived a predation attempt and shows bite marks on the phragmocone. This is the second report of an ectocochleate cephalopod and first report of an orthoconic nautiloid which survived massive damage of conch and siphuncle. For the first time, a high−magnesium calcitic mineralogy of cameral deposits is documented. These deposits were formed in alternation with aragonite in a chamber which was perforated during the unsuccessful predation attempt. The animal formed the chamber deposits throughout its entire lifetime and the siphuncle played a major role in formation of the cameral deposits.
Źródło:: Acta Palaeontologica Polonica; 2012, 57, 2
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 8.

Tytuł:: Simultaneous detection of astrovirus, rotavirus, reovirus and adenovirus type I in broiler chicken flocks
Autorzy:: Roussan, D.A.
Shaheen, I.A.
Khawaldeh, G.Y.
Totanji, W.S.
Al-Rifai, R.H.
Powiązania:: https://bibliotekanauki.pl/articles/30522.pdf
Data publikacji:: 2012
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Opis:: Enteric diseases cause substantial economic losses to the poultry industry. Astroviruses, rotaviruses, reoviruses, and adenovirus type 1 have been reported as a significant cause of intestinal symptoms in poultry. In the present study, intestinal samples from 70 commercial broiler chicken flocks were examined for the presence of astroviruses, rotavirus, and reovirus by reverse transcription-polymerase chain reaction, and for the presence of group I adenovirus by polymerase chain reaction. Astroviruses were identified in 38.6% of samples tested. Both avian nephritis virus and chicken astrovirus were identified in the astrovirus positive flocks, where 74.1% of these flocks were positive for only one type of astrovirus, whereas, 25.9% of these flocks were positive for both types of astrovirus. Reoviruses, rotaviruses, and adenoviruses were identified in 21.4, 18.6, and 14.3% of these flocks, respectively. Concomitant infection with two or more viruses in the same flock were also prominent, where 5.7, 5.7, 2.9, 2.9, 1.4, and 1.4% of these flocks were positive with both astrovirus and rotavirus; astrovirus and adenovirus; astrovirus and reovirus; rotavirus and adenovirus; rotavirus and reovirus; and reovirus and adenovirus respectively. Moreover, 4.3 and 2.7% of these flocks were positive for astrovirus, reovirus, and adenovirus; and astrovirus, reovirus, and rotavirus, respectively. Further studies will focus on identifying specific viral factors or subtypes/subgroups associated with disease through pathogenesis studies, economic losses caused by infections and co-infections of these pathogens, and the costs and benefits of countermeasures.
Źródło:: Polish Journal of Veterinary Sciences; 2012, 15, 2
1505-1773
Pojawia się w:: Polish Journal of Veterinary Sciences
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 9.

Tytuł:: Piggyback whorls: A new theoretical morphologic model reveals constructional linkages among morphological characters in ammonoids
Autorzy:: Ubukata, T
Tanabe, K.
Shigeta, Y.
Maeda, H.
Mapes, R.H.
Powiązania:: https://bibliotekanauki.pl/articles/20269.pdf
Data publikacji:: 2008
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: morphospace
morphology
morphological data
fossil animal
constructional linkage
ammonoid
paleontology
cross-sectional shape
computer simulation
shell growth
morphological diversity
Opis:: A new theoretical morphological model is proposed for the analysis of growth, form and morphospace of ammonoid shells. In this model, the shape of a radial cross section through the shell is simulated by “piggybacking” of successive whorls. The “piggyback whorls model” is defined in terms of the enlarging rate of the perimeter and the proportion of the dorsal wall to the whorl periphery, if an isometric relationship is assumed between perimeter and area of the cross−sectioned whorl. Allometric coefficients on these growth parameters determine how compressed and evolute shells are formed. The present model successfully reproduced some correlations among purely geometric variables that have been reported in previous works and were also observed in our biometric analyses. This model yields a hypothesis of “constructional linkages” between aperture shape and coiling geometry that might provide a functional coupling between hydrostatic and hydrodynamic characters. The model may partly explain Buckman’s Law of Covariation between rib features and shell shapes.
Źródło:: Acta Palaeontologica Polonica; 2008, 53, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 10.

Tytuł:: Auschwitz i alianci : czy można było zapobiec okropnościom Auschwitz?
Autorzy:: Gilbert, Martin.
Powiązania:: Gazeta Wyborcza 2005, nr 24. Dod. "Gazeta Świąteczna", s. 13
Współwytwórcy:: SK. Tłumaczenie
RH. Tłumaczenie
Data publikacji:: 2005
Tematy:: Auschwitz-Birkenau (niemiecki obóz koncentracyjny)
Niemieckie nazistowskie obozy koncentracyjne
Holokaust
II wojna światowa (1939-1945)
Sojusze polityczno-wojskowe
Martyrologia
Opis:: Tł. art. zamieszcz. w "Times". --- 2005, 22 IV.
Dostawca treści:: Bibliografia CBW

Artykuł

Zmień widok

na półce

Skocz do pozycji: 11.

Tytuł:: Chaetognath grasping spines from the Upper Mississippian of Arkansas [USA]
Autorzy:: Doguzhaeva, L A
Mutvel, H.
Mapes, R.H.
Powiązania:: https://bibliotekanauki.pl/articles/23070.pdf
Data publikacji:: 2002
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: grasping spine
fossil
USA
protoconodont
organic spine
phosphatized fossil
morphology
Arkansas
ultrastructure
Chaetognatha
paleontology
chaetognath
Opis:: Previously unidentified tiny (about 0.5 mm in length), hollow, gently curved, serrated spines probably originally composed of horny, organic fibers from the Upper Mississippian (Middle Chesterian = Namurian A equivalent or lower Serpukhovian) of Arkansas (USA) are described, and their probable chaetognath affinities are discussed. The specimens are preserved in an oval accumulation (about 15 mm long and 6 mm wide) of approximately 200 specimens within a small (about 25 mm in length) phosphatic concretion. For comparison, the grasping spines of the Recent chaetognath Eukrohnia hamata were examined. The Arkansas specimens are named Eoserratosagitta serrata gen. et sp. nov., and this genus is assigned to the Phylum Chaetognatha. The Upper Mississippian spines are also compared with protoconodonts. This comparison supports the hypothesis that the chaetognaths may have existed in the Cambrian.
Źródło:: Acta Palaeontologica Polonica; 2002, 47, 3
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki

Artykuł

Zmień widok

na półce

Skocz do pozycji: 12.

Tytuł:: Dorsal shell wall in ammonoids
Autorzy:: Kulicki, C
Tanabe, K.
Landman, N.H.
Mapes, R.H.
Powiązania:: https://bibliotekanauki.pl/articles/20686.pdf
Data publikacji:: 2001
Wydawca:: Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:: dorsal wall
Ammonoidea
biomineralization
dorsal shell
Sibirites
body organ
Aconeceras
shell wall
paleontology
ultrastructure
wrinkle layer
ammonoid
paleozoology
Subolenekites
Opis:: In ammonoids, a soft body organ (possibly a supracephalicmantle fold), extending from the conch aperture secreted aragonitic wrinkles, forming a layer on the surface of the preceding whorl. The dorsal shell wall consists of the outer and inner components which were deposited sequentially, beginning at the aperture of the living chamber inwards. The dorsal wall attains its full thickness near the last septum. The outer component is visible in the apertural region and is smooth or wrinkled; it is called the wrinkled layer in the latter case. The wrinkles may be continuous, interrupted, or form isolated patches arranged in rows. The wrinkles are usually triangular in cross section. A further stage of dorsal wall development involves filling in the space between the apices of triangles, and then adding one or more inner prismatic layers from the inside of the living chamber. This pattern occurs at least in the postembryonic stage of all genera studied, belonging to five suborders of Ammonoidea ranging from Late Carboniferousto Late Cretaceous. In many genera, the outer component of the dorsal shell wall exhibits remarkable ontogenetic change in its ultrastructure and microornament. It may be compared with the black film of Recent Nautilus shells with respect to place of formation. The outer component of the ammonoid dorsal shell wall is regarded as a product of organic secretion and carbonate precipitation in the area of the supracephalic mantle fold.
U planispiralnie skręconych amonoidów, u których ścianka grzbietowa styka się bezpośrednio ze ścianką poprzedniego skrętu, mamy do czynienia z modyfikacją strukturalną ścianki grzbietowej w obszarze styku obu ścianek. Wymienione modyfikacje dotyczą w głównej mierze zewnętrznego składnika ścianki grzbietowej tzw. wrinkle-layer, położonego bezpośrednio na peryostrakum poprzedniego skrętu. Strefa zmarszczek (wrinkle-layer) znana była początkowo jedynie u amonoidów paleozoicznych, dopiero Senior (1971) i Kulicki (1979) odnotowali jej występowanie u amonoidów mezozoicznych. Na podstawie przebadanego materiału obejmującego 12 rodzajów należących do pięciu podrzędów Ammonoidea i występujących od późnego paleozoiku do późnej kredy nie stwierdzono występowania strefy zmarszczek poza ścianką grzbietową. Podobne suuktury, obserwowane u paleozoicznych amonoidów w ściankach bocznej i brzusznej nosza nazwę „Ritzstreifen” i nie są homologiczne do zmarszczek „wrinkle-layer”. Typowa zmarszczka „wrinkle-layer” w przekroju podłuznym zbudowana jest z elementu centralnego, organicznego lub organo-mineralnego, oraz pryzmatycznych warstewek, w których długie osie pryzm są prostopadłe do boków trójkąta skierowanych do wnętrza komory mieszkalnej. Obok typowych elementów strefy zmarszczek, opisano tzw. elementy dwurożne o zarysie okrągłym, lub owalnym u triasowych rodzajów Subolenekites i Sibirites, a także u wczesnokredowego Aconeceras. Te elementy były błędnie interpretowane (Doguzhaeva & Mutvei 1986) jako pory związane z przyczepami miękkich tkanek płaszcza do muszli. Typowa strefa zmarszczek wytwarzana przez fałd nadgłowowy płaszcza, została stwierdzona we wszystkich badanych podrzędach za wyjątkiem Phylloceratina. W wymienionym rzędzie opisano powszechnie występujące rytmiczne modyfikacje peryostrakum wbudowywane do ścianki grzbietowej. We wczesnych stadiach rozwojowych modyfikacje te mogą przypominać elementy strefy zmarszczek, lecz ich pochodzenie i budowa są różne.
Źródło:: Acta Palaeontologica Polonica; 2001, 46, 1
0567-7920
Pojawia się w:: Acta Palaeontologica Polonica
Dostawca treści:: Biblioteka Nauki