35 research outputs found
Aquaculture vis-a-vis agriculture
The effect of aquaculture, especially shrimp farming, on agriculture has caused heated debate among aquaculturists, agriculturists, and non-governmental organizations. As data on the negative impact of shrimp farming on adjacent rice fields are not available, a study was undertaken in rice fields skirting three shrimp farms: a semi-intensive farm; an extensive farm; and a semi-intensive farm with a buffer zone. The buffer zone was found to be helpful in preventing salinization of the adjacent agricultural fields and the Electrical Conductivity (EC) values (less than 1) reported were found to be harmless to the rice crop. Thus, aquaculture and agriculture can coexist in coastal areas if there are buffer zones in between
Krusadai Island: the Biologist's Paradise
The name Krusadai may symbolically
mean Lord Shiva with matted locks - as a
manifestation of Lord Dakshinamurti. The
exact meaning of the word Krusadai is
difficult to fathom . 'Kru' (as a corrupt form
of 'Kuru' may also mean short or abridged)
is perhaps wrongly spelt for Guru meaning
Teacher or Mentor. (in Tamil,in both ways
'Kru' or 'Guru', it could be written).
Assuming its Tamil version of the word 'Kru'
to mean Guru = i.e ., 'Mentor' or Nestor - and
'Sadai' meaning matted locks, we can
visualise the picture of Lord Dakshinamurti.
In its serene atmosphere, the place is
veritably ' an eternal abode for silent
meditation. Lord Dakshinamurti is
known to teach and dispel all doubts
of 'sishayas' or disciples by transmitting
the lessons of discourses and answers and
replies to doubts raised ''through thought
waves" in eloquent silence and in eternal
bliss, when and where speech becomes
superfluous
Coral : "The excellent bone graft material"
Man's first use of corals can be traced back almost to 25,000 years as evidenced through small beads of perforated red corals recovered from the burial sites in Europe. These were perhaps used as ornaments and possibility traded by early man
Present status of coral reefs in Gulf of Mannar Islands
Coral reefs are the most diverse marine
ecosystems in the world. Typically they
contain number of specialised species
representing almost all groups of marine
animals. One of the reasons for the great
diversity of life in coral reef is the diversified
habitats they offer. The great number of
holes and crevices in the reef provides
abundant shelter for fishes and
invertebrates. Coral reefs are also important
nurseries and are thus a peculiar store
house and repository of various animals
Efficiency of universal barcode gene (Cox1) on morphologically cryptic Mugilidae fishes delineation.
An effort was made to assess the utility of 650 bp partial Cytochrome C oxidase subunit I (DNA barcode) gene in delineating the members of taxonomically ambiguous marine fin fishes (Family: Mugilidae). To address the issue we used all the 95 barcode sequences of Mugilidae family available at NCBI (National Centre for Biotechnological Information) along with the barcode data generated from Mugilidae fishes of Parangipettai coastal waters. The average GC content of Mugilidae was found to be 46.46%. Crenimugil crenilabis showed less GC content (44.55%) whereas Liza macrolepis showed high GC content (48.53%) among the mullet species studied. The phylogenetic and genetic distance data showed that Mugil platanus and M. liza represent the continuum of same species. Among the members of family Mugilidae, the genus Mugil might possibly contains more haplotype diversity as revealed by intra-species genetic distance data. Species within genera of Mugilidae family invariably clustered in single clade with high bootstrap value. We conclude that partial COI sequencing (barcoding) in identifying the members of the family and that way has resolved the taxonomic ambiguity among the members of the family Mugilidae
Photodynamic therapy associated with full-mouth ultrasonic debridement in the treatment of severe chronic periodontitis: a randomized-controlled clinical trial
BACKGROUND: Photodynamic therapy (PDT) is a method of microbial reduction which can benefit periodontal treatment in areas of difficult access, such as deep pockets and furcations. The aim of this randomized controlled clinical trial was to evaluate the effects of PDT as an adjunct to full-mouth ultrasonic debridement in the treatment of severe chronic periodontitis. MATERIAL AND METHODS: Twenty-two patients with at least one pocket with a probing depth (PD) of ≥7 mm and one pocket with a PD of ≥5 mm and bleeding on probing (BOP) on each side of the mouth were included, characterizing a split mouth design. The control group underwent full-mouth ultrasonic debridement and the test group received the same treatment associated with PDT. The PDT was performed on only one side of the mouth and the initial step consisted of subgingival irrigation with 0.005% methylene blue dye. Two minutes after applying the photosensitizer, the low power laser - AsGaAl (Photon Lase III - PL7336, DMC, São Carlos -São Paulo, Brazil) was applied (660 nm, 100 mW, 9 J, 90 seconds per site, 320 J/cm(2), diameter tip 600 µm).The following clinical parameters were evaluated: plaque index, gingival index, BOP, gingival recession (GR), PD, and clinical attachment level (CAL). All parameters were collected before, 1, 3 and 6 months after treatment. RESULTS: An improvement in BOP, PD and CAL was observed after treatment, in both groups, but without any difference between them. After 6 months, the PD decreased from 5.11±0.56 mm to 2.83±0.47 mm in the test group (p<0.05) and from 5.15±0.46 mm to 2.83±0.40 mm in the control group (p<0.05). The CAL changed, after 6 months, from 5.49±0.76 mm to 3.41±0.84 mm in the test group (p<0.05) and from 5.53±0.54 to 3.39±0.51 mm in the control group (p<0.05). CONCLUSION: Both approaches resulted in significant clinical improvements in the treatment of severe chronic periodontits, however, the PDT did not provide any additional benefit to those obtained with full-mouth ultrasonic debridement used alone
Pattern of accumulation of heavy metals (Copper and Zinc) in the estuarine hermit crab <i>Clibanarius longitarsus </i>(De Hann)
117-120The 96 h LC50 value of copper and zinc was
8ppm and 12ppm respectively for Clibanarius longitarsus. Based on
the LC50 value, three sublethal concentrations were chosen for individual
exposure in each metal. Pattern of accumulation of heavy metals in the tissues
of C. longitarsus noticed in the
laboratory was similar to what was observed in the environment: hepatopancreas
> ovary > muscle (exposed to both the metals–copper and zinc). Further, increased
uptake of metals by tissues was recorded with increase in the test
concentrations
Not Available
Not AvailableThe name Krusadai may symbolically
mean Lord Shiva with matted locks - as a
manifestation of Lord Dakshinamurti. The
exact meaning of the word Krusadai is
difficult to fathom . 'Kru' (as a corrupt form
of 'Kuru' may also mean short or abridged)
is perhaps wrongly spelt for Guru meaning
Teacher or Mentor. (in Tamil,in both ways
'Kru' or 'Guru', it could be written).
Assuming its Tamil version of the word 'Kru'
to mean Guru = i.e ., 'Mentor' or Nestor - and
'Sadai' meaning matted locks, we can
visualise the picture of Lord Dakshinamurti.
In its serene atmosphere, the place is
veritably ' an eternal abode for silent
meditation. Lord Dakshinamurti is
known to teach and dispel all doubts
of 'sishayas' or disciples by transmitting
the lessons of discourses and answers and
replies to doubts raised ''through thought
waves" in eloquent silence and in eternal
bliss, when and where speech becomes
superfluous!Not Availabl
Assessment of ecological quality of Vellar and Uppanar estuaries, southeast coast of India, using Benthos
1989-1995<span style="font-size:9.0pt;font-family:
" times="" new="" roman";mso-fareast-font-family:"times="" roman";mso-bidi-font-family:="" mangal;mso-ansi-language:en-gb;mso-fareast-language:en-us;mso-bidi-language:="" hi"="" lang="EN-GB">Number of polychaete species identified from Vellar and Uppanar estuaries
were 52 and 14 species respectively. Diversity
indices were high in Vellar estuary (<span style="mso-bidi-font-style:
italic">H<span style="font-size:9.0pt;font-family:
" times="" new="" roman";mso-fareast-font-family:cmsy7;mso-bidi-font-family:mangal;="" mso-ansi-language:en-gb;mso-fareast-language:en-us;mso-bidi-language:hi"="" lang="EN-GB">’log2-4.264±0.21, d-5.782±0.65<span style="mso-bidi-font-style:
italic">, J-0.964±0.008, <span style="color:black;mso-bidi-font-weight:
bold">Lambda'–0.02±0.004 and sPhi+-1906±264.99) and low in Uppanar estuary (H’<span style="font-size:9.0pt;
font-family:" times="" new="" roman";mso-fareast-font-family:"times="" roman";="" mso-bidi-font-family:mangal;mso-ansi-language:en-gb;mso-fareast-language:en-us;="" mso-bidi-language:hi"="" lang="EN-GB">log2-0.941±0.27, d-1.130±0.42, J-0.418±0.05<span style="mso-bidi-font-style:
italic">, Lambda'– 0.70±0.07 <span style="mso-bidi-font-style:
italic">and sPhi+ 433±102.74). While the BI (AMBI–1.03±0.19) and M-AMBI
(M-AMBI-0.90±0.06) values of Vellar estuary corresponded
to the undisturbed nature and high/good estuarine ecological quality
respectively, the above values in Uppanar
showed the polluted (AMBI–4.47±0.14)
and poor/bad status (M-AMBI-0.22±0.04) of estuarine ecological
quality. Recently introduced tools such as AMBI &
M-AMBI have clearly brought out
the impaired health of Uppanar estuary and healthy nature of Vellar
estuary.</span
Not Available
Not AvailableCoral reefs are the most diverse marine
ecosystems in the world. Typically they
contain number of specialised species
representing almost all groups of marine
animals. One of the reasons for the great
diversity of life in coral reef is the diversified
habitats they offer. The great number of
holes and crevices in the reef provides
abundant shelter for fishes and
invertebrates. Coral reefs are also important
nurseries and are thus a peculiar store
house and repository of various animals.Not Availabl