Ontogenetic movements of juvenile blacktip reef sharks: evidence of dispersal and connectivity between coastal habitats and coral reefs     

A Chin  MR Heupel  CA Simpfendorfer  AJ Tobin 《水产资源保护:海洋与淡水生态系统》2013,23(3):468-474

Direct somatic embryogenesis in Epipactis veratrifolia,a temperate terrestrial orchid     

Shirin Moradi  Mostafa Arab  Kourosh Vahdati 《The Journal of Horticultural Science and Biotechnology》2017,92(1):88-97

Most temperate terrestrial orchids are endangered species. Attempts to produce plantlets from plants of the genus Epipactis by asexual methods have totally failed. This study was conducted using somatic embryogenesis as a rapid vegetative propagation technique for conservation of E. veratrifolia. For these purposes, effects of different types of plant growth regulators (PGRs), different types of explants, light and dark conditions, and the effect of gibberellic acid (GA₃) and Paclobutrazol (PBZ) were investigated on somatic embryogenesis induction. Abscisic acid (ABA) pre-treatment effectiveness on inducting somatic embryogenesis and increasing the number of embryos per explant were investigated. Subsequently, 16 media were tested to find the best medium for plant regeneration and shoot and root proliferation. BA (3 mg L^?1) resulted in a better response than the other PGRs by supporting the development of 17 embryos per protocorm. PBZ, which resulted in 11 embryos per explant, was better than GA₃. FAST medium supplemented with organic substances was recognized as the best medium for plant regeneration and shoot and root proliferation. ABA pre-treatment had positive effect on somatic embryogenesis initiation. This study, for the first time, succeeded in finding a rapid and suitable protocol for propagation and genetic resource conservation of E. veratrifolia.  相似文献   

Substrate choice of territorial male Topeka shiners (Notropis topeka) in the absence of sunfish (Lepomis sp.)     

C. C. Witte  M. L. Wildhaber  A. Arab  D. B. Noltie 《Ecology of Freshwater Fish》2009,18(3):350-359

Abstract –  Topeka shiners ( Notropis topeka ), an endangered minnow species, typically spawn on or around breeding Lepomis sunfish (Centrarchidae) nests. Why spawning Topeka shiners are attracted to these nests is unclear, but having the nesting sunfish provide shiner eggs with improved aeration, a lessening of siltation, and protection from egg predators are possibilities. We tested the substrate utilisation of Topeka shiners in outdoor tanks in the absence of sunfish to determine the shiner's fundamental choice. Shiners were provided with substrate patches of cleaned sand, small gravel, large gravel, and small cobble, and the bare floor of the tank. The substrate above which a male shiner established his territory was used as evidence of choice. A statistically significant choice for sand substrates was demonstrated. This fundamental choice might influence which sunfish nests Topeka shiners use, given that nest substrate characteristics differ both between sunfish species and within species by spawning site location.  相似文献   

Retracted: Effect of Post‐Thaw Storage Time on Motility and Fertility of Cryopreserved Beluga Sturgeon (Huso huso) Sperm          下载免费PDF全文

MS Aramli  RM Nazari  MR Gharibi 《Reproduction in domestic animals》2015,50(2):349-352

The aim of this study was to test the influence of post ‐ thaw storage time on the duration of sperm motility, percentage of motile sperm, and fertilization and hatching rates of fresh sperm and sperm stored for 0, 30 and 60 min at 4°C post‐thawing. After being frozen in liquid nitrogen and then thawed, the percentage of motile sperm and duration of motility were not affected by 30 min of storage at 4°C, whereas a significant decline in these parameters was observed after 60 min of storage. Similarly, fertilization and hatching rates were significantly affected within 60 min of storage at 4°C, and the fertility of frozen‐thawed sperm was significantly lower than that of fresh sperm. We conclude that cryopreserved sperm of beluga sturgeon could be stored for 30 min without the loss of sperm quality. This described procedure for beluga sturgeon cryopreservation is reliable and efficient and therefore can be recommended for hatchery practice after scaling up this technique.  相似文献   

The Influence of Morphology,Follicle Size and Bcl‐2 and Bax Transcripts on the Developmental Competence of Bovine Oocytes     

THC De Bem  PR Adona  FF Bressan  LG Mesquita  MR Chiaratti  FV Meirelles  CLV Leal 《Reproduction in domestic animals》2014,49(4):576-583

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In vitro propagation of GF677 hybrid rootstock (Prunus persica × Prunus amygdalus) from mature cotyledons     

M. R. Arab 《The Journal of Horticultural Science and Biotechnology》2016,91(3):236-242

Adventitious shoot regeneration from mature cotyledons of GF677 rootstock (Prunus persica × Prunus amygdalus) was achieved in vitro. Thidiazuron (N-phenyl-N-1,2,3-thidiazol-5-yl-urea; TDZ) at 32 µM gave the highest percentage of cotyledons forming adventitious shoots (68.8%) and the highest number of shoots per cotyledon (4.8) on Quoirin and Lepoivre (QL) medium. On QL medium containing 32 µM TDZ, exposure of the proximal segments of cotyledons to darkness at the start of culture increased the percentage of cotyledons forming adventitious shoots (62.5%) when compared with those kept under light conditions (15%). A combination of 0.72 µM gibberellic acid and dark treatment resulted in at least 2.7-fold more elongated shoots than non-treated shoots. The highest rooting percentage (100%) occurred on 0.5× Murashige and Skoog medium supplemented with Gamborg (B5) vitamins and 2 mg l^?1 indole-3-butyric acid. Rooted plantlets were acclimatised under greenhouse conditions with a 70% survival rate.  相似文献   

Rhodococcus equi-associated osteomyelitis in foals     

EC FIRTH  MR ALLEY†  H HODGE 《Australian veterinary journal》1993,70(8):304-307

Two cases of Rhodococcus equl infection in foals are described, in which osteomyelitis was a feature. Because rhodococcal infection is usually low grade and chronic, and because the signs of early metaphysitis can be subtle, any articular or periarticular swelling in a foal from a farm with a history of rhodococcosis should be strongly suspected to be associated with R equl until proven otherwise.  相似文献   

Reply     

MR ALDERTON 《Australian veterinary journal》1993,70(11):429-430

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Predictors of pregnancy and postpartum haemoglobin concentrations in low-income women   总被引：1，自引：0，他引：1  

Bodnar LM  Siega-Riz AM  Arab L  Chantala K  McDonald T 《Public health nutrition》2004,7(6):701-711

OBJECTIVE: Pregnancy and postpartum iron status is of great public health importance, yet few studies have examined predictors of haemoglobin (Hb) concentration during this time. We identified predictors of Hb from 24 weeks' gestation until delivery and from 4 to 25 weeks postpartum. DESIGN: Blood was drawn as many as four times during care: at the initial visit, at 24-29 weeks' gestation, at delivery and postpartum. A longitudinal, multivariable linear regression model was used to predict Hb concentration. SETTING: A public health clinic in Raleigh, North Carolina.Subjects: n=520 women who participated in the Iron Supplementation Study. RESULTS: Hb concentration at the previous blood draw, short stature, non-Hispanic white ethnicity/race, >12 years of education and smoking were positive predictors of pregnancy and postpartum Hb concentrations. Iron supplement use was a positive predictor, while inadequate weight gain and severe nausea/vomiting were negative predictors of gestational Hb. A high infant birth weight and postpartum haemorrhage were negative predictors of postpartum Hb. Pre-pregnancy body mass index had a slight positive relationship with gestational Hb, but had a strong negative relationship with postpartum Hb. The longitudinal model also confirmed the typical pattern of gestational Hb concentration. As the number of weeks between the initial visit and the 24- to 29-week visit increased, Hb at 24-29 weeks' gestation decreased. As gestational age increased from 24 weeks until delivery, Hb concentration increased as well. CONCLUSIONS: The predictors identified here could be used in clinical settings to target high-risk women for intervention.  相似文献   

Hydrops foetalis in dwarf calves associated with twinning     

PAW HARPER  MR LATTER  JF WILKINS 《Australian veterinary journal》1995,72(6):236-238

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